微信内网页某些安卓手机不能上传图片文件的问题(2)

起这个标题名只是为了和前一篇文章相对应。

相对比较完善的手机端网页图片上传完成了，其中碰见了很多问题，由于是第一次弄，就一个个的解决掉，最后这个目前来说是比较满意的版本。

开发环境为 Bootstrap框架，另外需要引进一个JS用于判断图片拍摄的角度问题。

为什么要用这个呢？因为IOS系统在拍摄照片时，会给生成的图片文件添加一个拍摄角度的数据，在文件上传时，是用HTML5的 canvas加载图片，然后输出base64字符串，在服务器上保存时图片会发生翻转，这个问题只在苹果手机上有，安卓手机没这个问题。我也是第一次知道这个东西。

先上这个js的代码：Exif.js

(function() {    var debug = false;    var root = this;    var EXIF = function(obj) {        if (obj instanceof EXIF) return obj;        if (!(this instanceof EXIF)) return new EXIF(obj);        this.EXIFwrapped = obj;    };    if (typeof exports !== 'undefined') {        if (typeof module !== 'undefined' && module.exports) {            exports = module.exports = EXIF;        }        exports.EXIF = EXIF;    } else {        root.EXIF = EXIF;    }    var ExifTags = EXIF.Tags = {        // version tags        0x9000 : "ExifVersion",             // EXIF version        0xA000 : "FlashpixVersion",         // Flashpix format version        // colorspace tags        0xA001 : "ColorSpace",              // Color space information tag        // image configuration        0xA002 : "PixelXDimension",         // Valid width of meaningful image        0xA003 : "PixelYDimension",         // Valid height of meaningful image        0x9101 : "ComponentsConfiguration", // Information about channels        0x9102 : "CompressedBitsPerPixel",  // Compressed bits per pixel        // user information        0x927C : "MakerNote",               // Any desired information written by the manufacturer        0x9286 : "UserComment",             // Comments by user        // related file        0xA004 : "RelatedSoundFile",        // Name of related sound file        // date and time        0x9003 : "DateTimeOriginal",        // Date and time when the original image was generated        0x9004 : "DateTimeDigitized",       // Date and time when the image was stored digitally        0x9290 : "SubsecTime",              // Fractions of seconds for DateTime        0x9291 : "SubsecTimeOriginal",      // Fractions of seconds for DateTimeOriginal        0x9292 : "SubsecTimeDigitized",     // Fractions of seconds for DateTimeDigitized        // picture-taking conditions        0x829A : "ExposureTime",            // Exposure time (in seconds)        0x829D : "FNumber",                 // F number        0x8822 : "ExposureProgram",         // Exposure program        0x8824 : "SpectralSensitivity",     // Spectral sensitivity        0x8827 : "ISOSpeedRatings",         // ISO speed rating        0x8828 : "OECF",                    // Optoelectric conversion factor        0x9201 : "ShutterSpeedValue",       // Shutter speed        0x9202 : "ApertureValue",           // Lens aperture        0x9203 : "BrightnessValue",         // Value of brightness        0x9204 : "ExposureBias",            // Exposure bias        0x9205 : "MaxApertureValue",        // Smallest F number of lens        0x9206 : "SubjectDistance",         // Distance to subject in meters        0x9207 : "MeteringMode",            // Metering mode        0x9208 : "LightSource",             // Kind of light source        0x9209 : "Flash",                   // Flash status        0x9214 : "SubjectArea",             // Location and area of main subject        0x920A : "FocalLength",             // Focal length of the lens in mm        0xA20B : "FlashEnergy",             // Strobe energy in BCPS        0xA20C : "SpatialFrequencyResponse",    //        0xA20E : "FocalPlaneXResolution",   // Number of pixels in width direction per FocalPlaneResolutionUnit        0xA20F : "FocalPlaneYResolution",   // Number of pixels in height direction per FocalPlaneResolutionUnit        0xA210 : "FocalPlaneResolutionUnit",    // Unit for measuring FocalPlaneXResolution and FocalPlaneYResolution        0xA214 : "SubjectLocation",         // Location of subject in image        0xA215 : "ExposureIndex",           // Exposure index selected on camera        0xA217 : "SensingMethod",           // Image sensor type        0xA300 : "FileSource",              // Image source (3 == DSC)        0xA301 : "SceneType",               // Scene type (1 == directly photographed)        0xA302 : "CFAPattern",              // Color filter array geometric pattern        0xA401 : "CustomRendered",          // Special processing        0xA402 : "ExposureMode",            // Exposure mode        0xA403 : "WhiteBalance",            // 1 = auto white balance, 2 = manual        0xA404 : "DigitalZoomRation",       // Digital zoom ratio        0xA405 : "FocalLengthIn35mmFilm",   // Equivalent foacl length assuming 35mm film camera (in mm)        0xA406 : "SceneCaptureType",        // Type of scene        0xA407 : "GainControl",             // Degree of overall image gain adjustment        0xA408 : "Contrast",                // Direction of contrast processing applied by camera        0xA409 : "Saturation",              // Direction of saturation processing applied by camera        0xA40A : "Sharpness",               // Direction of sharpness processing applied by camera        0xA40B : "DeviceSettingDescription",    //        0xA40C : "SubjectDistanceRange",    // Distance to subject        // other tags        0xA005 : "InteroperabilityIFDPointer",        0xA420 : "ImageUniqueID"            // Identifier assigned uniquely to each image    };    var TiffTags = EXIF.TiffTags = {        0x0100 : "ImageWidth",        0x0101 : "ImageHeight",        0x8769 : "ExifIFDPointer",        0x8825 : "GPSInfoIFDPointer",        0xA005 : "InteroperabilityIFDPointer",        0x0102 : "BitsPerSample",        0x0103 : "Compression",        0x0106 : "PhotometricInterpretation",        0x0112 : "Orientation",        0x0115 : "SamplesPerPixel",        0x011C : "PlanarConfiguration",        0x0212 : "YCbCrSubSampling",        0x0213 : "YCbCrPositioning",        0x011A : "XResolution",        0x011B : "YResolution",        0x0128 : "ResolutionUnit",        0x0111 : "StripOffsets",        0x0116 : "RowsPerStrip",        0x0117 : "StripByteCounts",        0x0201 : "JPEGInterchangeFormat",        0x0202 : "JPEGInterchangeFormatLength",        0x012D : "TransferFunction",        0x013E : "WhitePoint",        0x013F : "PrimaryChromaticities",        0x0211 : "YCbCrCoefficients",        0x0214 : "ReferenceBlackWhite",        0x0132 : "DateTime",        0x010E : "ImageDescription",        0x010F : "Make",        0x0110 : "Model",        0x0131 : "Software",        0x013B : "Artist",        0x8298 : "Copyright"    };    var GPSTags = EXIF.GPSTags = {        0x0000 : "GPSVersionID",        0x0001 : "GPSLatitudeRef",        0x0002 : "GPSLatitude",        0x0003 : "GPSLongitudeRef",        0x0004 : "GPSLongitude",        0x0005 : "GPSAltitudeRef",        0x0006 : "GPSAltitude",        0x0007 : "GPSTimeStamp",        0x0008 : "GPSSatellites",        0x0009 : "GPSStatus",        0x000A : "GPSMeasureMode",        0x000B : "GPSDOP",        0x000C : "GPSSpeedRef",        0x000D : "GPSSpeed",        0x000E : "GPSTrackRef",        0x000F : "GPSTrack",        0x0010 : "GPSImgDirectionRef",        0x0011 : "GPSImgDirection",        0x0012 : "GPSMapDatum",        0x0013 : "GPSDestLatitudeRef",        0x0014 : "GPSDestLatitude",        0x0015 : "GPSDestLongitudeRef",        0x0016 : "GPSDestLongitude",        0x0017 : "GPSDestBearingRef",        0x0018 : "GPSDestBearing",        0x0019 : "GPSDestDistanceRef",        0x001A : "GPSDestDistance",        0x001B : "GPSProcessingMethod",        0x001C : "GPSAreaInformation",        0x001D : "GPSDateStamp",        0x001E : "GPSDifferential"    };    var StringValues = EXIF.StringValues = {        ExposureProgram : {            0 : "Not defined",            1 : "Manual",            2 : "Normal program",            3 : "Aperture priority",            4 : "Shutter priority",            5 : "Creative program",            6 : "Action program",            7 : "Portrait mode",            8 : "Landscape mode"        },        MeteringMode : {            0 : "Unknown",            1 : "Average",            2 : "CenterWeightedAverage",            3 : "Spot",            4 : "MultiSpot",            5 : "Pattern",            6 : "Partial",            255 : "Other"        },        LightSource : {            0 : "Unknown",            1 : "Daylight",            2 : "Fluorescent",            3 : "Tungsten (incandescent light)",            4 : "Flash",            9 : "Fine weather",            10 : "Cloudy weather",            11 : "Shade",            12 : "Daylight fluorescent (D 5700 - 7100K)",            13 : "Day white fluorescent (N 4600 - 5400K)",            14 : "Cool white fluorescent (W 3900 - 4500K)",            15 : "White fluorescent (WW 3200 - 3700K)",            17 : "Standard light A",            18 : "Standard light B",            19 : "Standard light C",            20 : "D55",            21 : "D65",            22 : "D75",            23 : "D50",            24 : "ISO studio tungsten",            255 : "Other"        },        Flash : {            0x0000 : "Flash did not fire",            0x0001 : "Flash fired",            0x0005 : "Strobe return light not detected",            0x0007 : "Strobe return light detected",            0x0009 : "Flash fired, compulsory flash mode",            0x000D : "Flash fired, compulsory flash mode, return light not detected",            0x000F : "Flash fired, compulsory flash mode, return light detected",            0x0010 : "Flash did not fire, compulsory flash mode",            0x0018 : "Flash did not fire, auto mode",            0x0019 : "Flash fired, auto mode",            0x001D : "Flash fired, auto mode, return light not detected",            0x001F : "Flash fired, auto mode, return light detected",            0x0020 : "No flash function",            0x0041 : "Flash fired, red-eye reduction mode",            0x0045 : "Flash fired, red-eye reduction mode, return light not detected",            0x0047 : "Flash fired, red-eye reduction mode, return light detected",            0x0049 : "Flash fired, compulsory flash mode, red-eye reduction mode",            0x004D : "Flash fired, compulsory flash mode, red-eye reduction mode, return light not detected",            0x004F : "Flash fired, compulsory flash mode, red-eye reduction mode, return light detected",            0x0059 : "Flash fired, auto mode, red-eye reduction mode",            0x005D : "Flash fired, auto mode, return light not detected, red-eye reduction mode",            0x005F : "Flash fired, auto mode, return light detected, red-eye reduction mode"        },        SensingMethod : {            1 : "Not defined",            2 : "One-chip color area sensor",            3 : "Two-chip color area sensor",            4 : "Three-chip color area sensor",            5 : "Color sequential area sensor",            7 : "Trilinear sensor",            8 : "Color sequential linear sensor"        },        SceneCaptureType : {            0 : "Standard",            1 : "Landscape",            2 : "Portrait",            3 : "Night scene"        },        SceneType : {            1 : "Directly photographed"        },        CustomRendered : {            0 : "Normal process",            1 : "Custom process"        },        WhiteBalance : {            0 : "Auto white balance",            1 : "Manual white balance"        },        GainControl : {            0 : "None",            1 : "Low gain up",            2 : "High gain up",            3 : "Low gain down",            4 : "High gain down"        },        Contrast : {            0 : "Normal",            1 : "Soft",            2 : "Hard"        },        Saturation : {            0 : "Normal",            1 : "Low saturation",            2 : "High saturation"        },        Sharpness : {            0 : "Normal",            1 : "Soft",            2 : "Hard"        },        SubjectDistanceRange : {            0 : "Unknown",            1 : "Macro",            2 : "Close view",            3 : "Distant view"        },        FileSource : {            3 : "DSC"        },        Components : {            0 : "",            1 : "Y",            2 : "Cb",            3 : "Cr",            4 : "R",            5 : "G",            6 : "B"        }    };    function addEvent(element, event, handler) {        if (element.addEventListener) {            element.addEventListener(event, handler, false);        } else if (element.attachEvent) {            element.attachEvent("on" + event, handler);        }    }    function imageHasData(img) {        return !!(img.exifdata);    }    function base64ToArrayBuffer(base64, contentType) {        contentType = contentType || base64.match(/^data\:([^\;]+)\;base64,/mi)[1] || ''; // e.g. 'data:image/jpeg;base64,...' => 'image/jpeg'        base64 = base64.replace(/^data\:([^\;]+)\;base64,/gmi, '');        var binary = atob(base64);        var len = binary.length;        var buffer = new ArrayBuffer(len);        var view = new Uint8Array(buffer);        for (var i = 0; i < len; i++) {            view[i] = binary.charCodeAt(i);        }        return buffer;    }    function objectURLToBlob(url, callback) {        var http = new XMLHttpRequest();        http.open("GET", url, true);        http.responseType = "blob";        http.onload = function(e) {            if (this.status == 200 || this.status === 0) {                callback(this.response);            }        };        http.send();    }    function getImageData(img, callback) {        function handleBinaryFile(binFile) {            var data = findEXIFinJPEG(binFile);            var iptcdata = findIPTCinJPEG(binFile);            img.exifdata = data || {};            img.iptcdata = iptcdata || {};            if (callback) {                callback.call(img);            }        }        if (img.src) {            if (/^data\:/i.test(img.src)) { // Data URI                var arrayBuffer = base64ToArrayBuffer(img.src);                handleBinaryFile(arrayBuffer);            } else if (/^blob\:/i.test(img.src)) { // Object URL                var fileReader = new FileReader();                fileReader.onload = function(e) {                    handleBinaryFile(e.target.result);                };                objectURLToBlob(img.src, function (blob) {                    fileReader.readAsArrayBuffer(blob);                });            } else {                var http = new XMLHttpRequest();                http.onload = function() {                    if (this.status == 200 || this.status === 0) {                        handleBinaryFile(http.response);                    } else {                        throw "Could not load image";                    }                    http = null;                };                http.open("GET", img.src, true);                http.responseType = "arraybuffer";                http.send(null);            }        } else if (window.FileReader && (img instanceof window.Blob || img instanceof window.File)) {            var fileReader = new FileReader();            fileReader.onload = function(e) {                if (debug) console.log("Got file of length " + e.target.result.byteLength);                handleBinaryFile(e.target.result);            };            fileReader.readAsArrayBuffer(img);        }    }    function findEXIFinJPEG(file) {        var dataView = new DataView(file);        if (debug) console.log("Got file of length " + file.byteLength);        if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) {            if (debug) console.log("Not a valid JPEG");            return false; // not a valid jpeg        }        var offset = 2,            length = file.byteLength,            marker;        while (offset < length) {            if (dataView.getUint8(offset) != 0xFF) {                if (debug) console.log("Not a valid marker at offset " + offset + ", found: " + dataView.getUint8(offset));                return false; // not a valid marker, something is wrong            }            marker = dataView.getUint8(offset + 1);            if (debug) console.log(marker);            // we could implement handling for other markers here,            // but we're only looking for 0xFFE1 for EXIF data            if (marker == 225) {                if (debug) console.log("Found 0xFFE1 marker");                return readEXIFData(dataView, offset + 4, dataView.getUint16(offset + 2) - 2);                // offset += 2 + file.getShortAt(offset+2, true);            } else {                offset += 2 + dataView.getUint16(offset+2);            }        }    }    function findIPTCinJPEG(file) {        var dataView = new DataView(file);        if (debug) console.log("Got file of length " + file.byteLength);        if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) {            if (debug) console.log("Not a valid JPEG");            return false; // not a valid jpeg        }        var offset = 2,            length = file.byteLength;        var isFieldSegmentStart = function(dataView, offset){            return (                dataView.getUint8(offset) === 0x38 &&                dataView.getUint8(offset+1) === 0x42 &&                dataView.getUint8(offset+2) === 0x49 &&                dataView.getUint8(offset+3) === 0x4D &&                dataView.getUint8(offset+4) === 0x04 &&                dataView.getUint8(offset+5) === 0x04            );        };        while (offset < length) {            if ( isFieldSegmentStart(dataView, offset )){                // Get the length of the name header (which is padded to an even number of bytes)                var nameHeaderLength = dataView.getUint8(offset+7);                if(nameHeaderLength % 2 !== 0) nameHeaderLength += 1;                // Check for pre photoshop 6 format                if(nameHeaderLength === 0) {                    // Always 4                    nameHeaderLength = 4;                }                var startOffset = offset + 8 + nameHeaderLength;                var sectionLength = dataView.getUint16(offset + 6 + nameHeaderLength);                return readIPTCData(file, startOffset, sectionLength);                break;            }            // Not the marker, continue searching            offset++;        }    }    var IptcFieldMap = {        0x78 : 'caption',        0x6E : 'credit',        0x19 : 'keywords',        0x37 : 'dateCreated',        0x50 : 'byline',        0x55 : 'bylineTitle',        0x7A : 'captionWriter',        0x69 : 'headline',        0x74 : 'copyright',        0x0F : 'category'    };    function readIPTCData(file, startOffset, sectionLength){        var dataView = new DataView(file);        var data = {};        var fieldValue, fieldName, dataSize, segmentType, segmentSize;        var segmentStartPos = startOffset;        while(segmentStartPos < startOffset+sectionLength) {            if(dataView.getUint8(segmentStartPos) === 0x1C && dataView.getUint8(segmentStartPos+1) === 0x02){                segmentType = dataView.getUint8(segmentStartPos+2);                if(segmentType in IptcFieldMap) {                    dataSize = dataView.getInt16(segmentStartPos+3);                    segmentSize = dataSize + 5;                    fieldName = IptcFieldMap[segmentType];                    fieldValue = getStringFromDB(dataView, segmentStartPos+5, dataSize);                    // Check if we already stored a value with this name                    if(data.hasOwnProperty(fieldName)) {                        // Value already stored with this name, create multivalue field                        if(data[fieldName] instanceof Array) {                            data[fieldName].push(fieldValue);                        }                        else {                            data[fieldName] = [data[fieldName], fieldValue];                        }                    }                    else {                        data[fieldName] = fieldValue;                    }                }            }            segmentStartPos++;        }        return data;    }    function readTags(file, tiffStart, dirStart, strings, bigEnd) {        var entries = file.getUint16(dirStart, !bigEnd),            tags = {},            entryOffset, tag,            i;        for (i=0;i<entries;i++) {            entryOffset = dirStart + i*12 + 2;            tag = strings[file.getUint16(entryOffset, !bigEnd)];            if (!tag && debug) console.log("Unknown tag: " + file.getUint16(entryOffset, !bigEnd));            tags[tag] = readTagValue(file, entryOffset, tiffStart, dirStart, bigEnd);        }        return tags;    }    function readTagValue(file, entryOffset, tiffStart, dirStart, bigEnd) {        var type = file.getUint16(entryOffset+2, !bigEnd),            numValues = file.getUint32(entryOffset+4, !bigEnd),            valueOffset = file.getUint32(entryOffset+8, !bigEnd) + tiffStart,            offset,            vals, val, n,            numerator, denominator;        switch (type) {            case 1: // byte, 8-bit unsigned int            case 7: // undefined, 8-bit byte, value depending on field                if (numValues == 1) {                    return file.getUint8(entryOffset + 8, !bigEnd);                } else {                    offset = numValues > 4 ? valueOffset : (entryOffset + 8);                    vals = [];                    for (n=0;n<numValues;n++) {                        vals[n] = file.getUint8(offset + n);                    }                    return vals;                }            case 2: // ascii, 8-bit byte                offset = numValues > 4 ? valueOffset : (entryOffset + 8);                return getStringFromDB(file, offset, numValues-1);            case 3: // short, 16 bit int                if (numValues == 1) {                    return file.getUint16(entryOffset + 8, !bigEnd);                } else {                    offset = numValues > 2 ? valueOffset : (entryOffset + 8);                    vals = [];                    for (n=0;n<numValues;n++) {                        vals[n] = file.getUint16(offset + 2*n, !bigEnd);                    }                    return vals;                }            case 4: // long, 32 bit int                if (numValues == 1) {                    return file.getUint32(entryOffset + 8, !bigEnd);                } else {                    vals = [];                    for (n=0;n<numValues;n++) {                        vals[n] = file.getUint32(valueOffset + 4*n, !bigEnd);                    }                    return vals;                }            case 5:    // rational = two long values, first is numerator, second is denominator                if (numValues == 1) {                    numerator = file.getUint32(valueOffset, !bigEnd);                    denominator = file.getUint32(valueOffset+4, !bigEnd);                    val = new Number(numerator / denominator);                    val.numerator = numerator;                    val.denominator = denominator;                    return val;                } else {                    vals = [];                    for (n=0;n<numValues;n++) {                        numerator = file.getUint32(valueOffset + 8*n, !bigEnd);                        denominator = file.getUint32(valueOffset+4 + 8*n, !bigEnd);                        vals[n] = new Number(numerator / denominator);                        vals[n].numerator = numerator;                        vals[n].denominator = denominator;                    }                    return vals;                }            case 9: // slong, 32 bit signed int                if (numValues == 1) {                    return file.getInt32(entryOffset + 8, !bigEnd);                } else {                    vals = [];                    for (n=0;n<numValues;n++) {                        vals[n] = file.getInt32(valueOffset + 4*n, !bigEnd);                    }                    return vals;                }            case 10: // signed rational, two slongs, first is numerator, second is denominator                if (numValues == 1) {                    return file.getInt32(valueOffset, !bigEnd) / file.getInt32(valueOffset+4, !bigEnd);                } else {                    vals = [];                    for (n=0;n<numValues;n++) {                        vals[n] = file.getInt32(valueOffset + 8*n, !bigEnd) / file.getInt32(valueOffset+4 + 8*n, !bigEnd);                    }                    return vals;                }        }    }    function getStringFromDB(buffer, start, length) {        var outstr = "";        for (n = start; n < start+length; n++) {            outstr += String.fromCharCode(buffer.getUint8(n));        }        return outstr;    }    function readEXIFData(file, start) {        if (getStringFromDB(file, start, 4) != "Exif") {            if (debug) console.log("Not valid EXIF data! " + getStringFromDB(file, start, 4));            return false;        }        var bigEnd,            tags, tag,            exifData, gpsData,            tiffOffset = start + 6;        // test for TIFF validity and endianness        if (file.getUint16(tiffOffset) == 0x4949) {            bigEnd = false;        } else if (file.getUint16(tiffOffset) == 0x4D4D) {            bigEnd = true;        } else {            if (debug) console.log("Not valid TIFF data! (no 0x4949 or 0x4D4D)");            return false;        }        if (file.getUint16(tiffOffset+2, !bigEnd) != 0x002A) {            if (debug) console.log("Not valid TIFF data! (no 0x002A)");            return false;        }        var firstIFDOffset = file.getUint32(tiffOffset+4, !bigEnd);        if (firstIFDOffset < 0x00000008) {            if (debug) console.log("Not valid TIFF data! (First offset less than 8)", file.getUint32(tiffOffset+4, !bigEnd));            return false;        }        tags = readTags(file, tiffOffset, tiffOffset + firstIFDOffset, TiffTags, bigEnd);        if (tags.ExifIFDPointer) {            exifData = readTags(file, tiffOffset, tiffOffset + tags.ExifIFDPointer, ExifTags, bigEnd);            for (tag in exifData) {                switch (tag) {                    case "LightSource" :                    case "Flash" :                    case "MeteringMode" :                    case "ExposureProgram" :                    case "SensingMethod" :                    case "SceneCaptureType" :                    case "SceneType" :                    case "CustomRendered" :                    case "WhiteBalance" :                    case "GainControl" :                    case "Contrast" :                    case "Saturation" :                    case "Sharpness" :                    case "SubjectDistanceRange" :                    case "FileSource" :                        exifData[tag] = StringValues[tag][exifData[tag]];                        break;                    case "ExifVersion" :                    case "FlashpixVersion" :                        exifData[tag] = String.fromCharCode(exifData[tag][0], exifData[tag][1], exifData[tag][2], exifData[tag][3]);                        break;                    case "ComponentsConfiguration" :                        exifData[tag] =                            StringValues.Components[exifData[tag][0]] +                            StringValues.Components[exifData[tag][1]] +                            StringValues.Components[exifData[tag][2]] +                            StringValues.Components[exifData[tag][3]];                        break;                }                tags[tag] = exifData[tag];            }        }        if (tags.GPSInfoIFDPointer) {            gpsData = readTags(file, tiffOffset, tiffOffset + tags.GPSInfoIFDPointer, GPSTags, bigEnd);            for (tag in gpsData) {                switch (tag) {                    case "GPSVersionID" :                        gpsData[tag] = gpsData[tag][0] +                            "." + gpsData[tag][1] +                            "." + gpsData[tag][2] +                            "." + gpsData[tag][3];                        break;                }                tags[tag] = gpsData[tag];            }        }        return tags;    }    EXIF.getData = function(img, callback) {        if ((img instanceof Image || img instanceof HTMLImageElement) && !img.complete) return false;        if (!imageHasData(img)) {            getImageData(img, callback);        } else {            if (callback) {                callback.call(img);            }        }        return true;    }    EXIF.getTag = function(img, tag) {        if (!imageHasData(img)) return;        return img.exifdata[tag];    }    EXIF.getAllTags = function(img) {        if (!imageHasData(img)) return {};        var a,            data = img.exifdata,            tags = {};        for (a in data) {            if (data.hasOwnProperty(a)) {                tags[a] = data[a];            }        }        return tags;    }    EXIF.pretty = function(img) {        if (!imageHasData(img)) return "";        var a,            data = img.exifdata,            strPretty = "";        for (a in data) {            if (data.hasOwnProperty(a)) {                if (typeof data[a] == "object") {                    if (data[a] instanceof Number) {                        strPretty += a + " : " + data[a] + " [" + data[a].numerator + "/" + data[a].denominator + "]\r\n";                    } else {                        strPretty += a + " : [" + data[a].length + " values]\r\n";                    }                } else {                    strPretty += a + " : " + data[a] + "\r\n";                }            }        }        return strPretty;    }    EXIF.readFromBinaryFile = function(file) {        return findEXIFinJPEG(file);    }    if (typeof define === 'function' && define.amd) {        define('exif-js', [], function() {            return EXIF;        });    }}.call(this));

页面需要添加这个js的引用

HTML代码

<div class="row-fluid" style=" margin-bottom:10px; margin-top:10px;">        <div class="col-xs-4" id="uploadDiv" style="margin:0px auto; height:90px; line-height:90px;">            <div style="width:90%; height:100%; border:dashed 1px #ddd;" class="ImageBox">                <input type="file" name="mulUp[]" multiple="multiple" required="required" id="SelectFile" style="display:none;" />                <div class="webuploader_pick">+</div>            </div>        </div>        <div class="col-xs-4" style="margin: 0px auto; height:90px; line-height:90px;display:none;" id="Image1"></div>

<input type="hidden" id="HiddenImageStr" />    </div>

这里 只是上传一张图片的示例，需要上传多张的请自行修改。

相关样式

.webuploader_pick {        -moz-user-select: none;        border-radius: 3px;        color: #cccccc;        cursor: pointer;        display: inline-block;        float: left;        font-size: 80px;        text-align: center;        line-height: 90px;        transition: border 0.2s;        -moz-transition: border 0.2s;        -webkit-transition: border 0.2s;        -o-transition: border 0.2s;        width: 100%;    }

JS处理代码：

    var FileArray = new Array();    FileArray = [];    var IsUpload = 0;    $(function () {        // 初始化        $(".webuploader_pick").bind("click", function (e) {            $("#SelectFile").click();        });        //上传图片相关        var photo = $("#SelectFile");        photo.on('change', function (event) {            Compress(event, function (base64Img) {                $.ajax({                    type: "POST",                    url: "", //你的上传处理文件                    data: JSON.stringify({                        "FileString": base64Img,              //图片的base64字符串                        "Angle": $("#HiddenImageStr").val()   //记录拍摄角度的东西                    }),                    contentType: "application/json;charset=utf-8",                    dataType: "text",                    cache: false,                    success: function (text) {                        //alert(text);                        FileArray.push(text);                        var serve_path = '';                        //根据存入 FileArray d的文件信息做相应操作                        for (var k = 0; k < FileArray.length; k++) {                            //取出数据做处理                            var st = FileArray[k];                            var str = st.split('|');                            var savepath = str[0];                            var imageName = str[1];                            var ImageHtml = "";                            ImageHtml += "<div style=\"width:90%; height:90px;background-size:100% 90px;background-repeat:no-repeat;background-image:url('" + serve_path + savepath + imageName + "')\">";                            ImageHtml += "<div style=\"float:right; right:0px;top:0px; width:30px; height:30px;\"  onclick=\"ToDelImage()\">";                            ImageHtml += "<img alt=\"\" src=\"@Url.Content("~/Content/images/TalkAbout/icon_delete_03.png")\" style=\"width:15px;height:15px; float:right; margin-top:0px;margin-right:0px;\"/>";                            ImageHtml += "</div>";                            ImageHtml += "<input type=\"hidden\" id=\"hiddenUploadImage\" value=\"" + st + "\"/>";                            ImageHtml += "</div>";                            $("#Image1").empty();                            $("#Image1").html(ImageHtml);                            $("#Image1").show();                            $("#uploadDiv").hide();                            IsUpload++;                        }                        FileArray = [];                    },                    error: function (XMLHttpRequest, textStatus, errorThrown) {                        alert(textStatus + errorThrown);                    }                });            });        });        function Compress(event, callback) {            if (window.File && window.FileList) {                var fileCount = document.getElementById("SelectFile").files.length;                if (fileCount > 1) {                    layer.confirm('每次可上传1张图片！', {                        btn: ['确定'], icon: 0                    });                    return;                }                else {                    //检查上传文件的类型                    var files = document.getElementById("SelectFile").files;                    for (var i = 0; i < files.length; i++) {                        var t = files[i].type.toLowerCase();                        var s = files[i].size;                        //判断是否为图片类型                        var isImage = 0;                        if (t.indexOf('jpg') >= 0)                            isImage++;                        if (t.indexOf('jpeg') >= 0)                            isImage++;                        if (t.indexOf('png') >= 0)                            isImage++;                        if (t.indexOf('gif') >= 0)                            isImage++;                        if (t.indexOf('bmp') >= 0)                            isImage++;                        if (isImage == 0) {                            layer.confirm('请选择图片类型文件上传！', {                                btn: ['确定'], icon: 0                            });                            return;                        }                    }                    if (files && files[0]) {                        EXIF.getData(files[0], function () {                            EXIF.getAllTags(this);                            var Orient = EXIF.getTag(this, 'Orientation');   //这个就是记录拍摄角度的东西                             var FR = new FileReader();                            FR.onload = function (e) {                                //获得一个图片对象                                var image = $("<img />");                                image.on('load', function () {                                    var actWidth;                                    var actHeight;                                    var maxwidth = 800;      //手机上最宽的定为800像素，太大的没有必要。可自行修改                                    var canvas = document.createElement("canvas");                                    var ctx = canvas.getContext("2d");                                    var Rorateangel;

<span style="white-space:pre"></span>    //这个是拍摄角度正常，或者没有设置过的                                    if (typeof (Orient) == "undefined" || parseInt(Orient) == 1) {                                        Rorateangel = 1;                                        actWidth = this.width;                                        actHeight = this.height;                                        var scale = actWidth / actHeight;                                        if (actWidth > maxwidth) {                                            canvas.width = maxwidth;                                            canvas.height = parseInt(maxwidth / scale);                                        }                                        else {                                            canvas.width = actWidth;                                            canvas.height = actHeight;                                        }                                    }                                    else if (parseInt(Orient) >= 3) {                                        Rorateangel = parseInt(Orient);                                        switch (Orient) {                                            case 6:         //拍摄时左转了90度                                                {                                                    actWidth = this.height;                                                    actHeight = this.width;                                                    var scale = actWidth / actHeight;                                                    if (actWidth > maxwidth) {                                                        canvas.height = maxwidth;                                                        canvas.width = parseInt(maxwidth / scale);                                                    }                                                    else {                                                        canvas.width = actWidth;                                                        canvas.height = actHeight;                                                    }                                                }                                                break;                                            case 8:     //拍摄时右转了90度                                                {                                                    actWidth = this.height;                                                    actHeight = this.width;                                                    var scale = actWidth / actHeight;                                                    if (actWidth > maxwidth) {                                                        canvas.height = maxwidth;                                                        canvas.width = parseInt(maxwidth / scale);                                                    }                                                    else {                                                        canvas.width = actWidth;                                                        canvas.height = actHeight;                                                    }                                                }                                                break;                                            case 3:     //拍摄是 翻转了180度                                                {                                                    actWidth = this.width;                                                    actHeight = this.height;                                                    var scale = actWidth / actHeight;                                                    if (actWidth > maxwidth) {                                                        canvas.width = maxwidth;                                                        canvas.height = parseInt(maxwidth / scale);                                                    }                                                    else {                                                        canvas.width = actWidth;                                                        canvas.height = actHeight;                                                    }                                                }                                                break;                                        }                                    }                                    $("#HiddenImageStr").val(Rorateangel);    //这个就是页面 用一个隐藏域放置翻转角度的值                                    ctx.drawImage(this, 0, 0, canvas.width, canvas.height);                                    var base64 = canvas.toDataURL('image/jpeg', 0.5);                                    callback(base64);                                });                                image.attr('src', e.target.result);                            };                            FR.readAsDataURL(files[0]);                        });                    }                }            }            else {                layer.confirm('抱歉，你的浏览器不支持FileAPI，请升级浏览器！', {                    btn: ['确定'], icon: 0                });                return;            }        }    });    //删除上传的图片方法    function ToDelImage() {        var deleteValue = $("#hiddenUploadImage").val();        $("#Image1").empty();        $("#Image1").hide();        $("#uploadDiv").show();        IsUpload--;        FileArray = [];        //在服务器上删除文件        $.ajax({            type: "POST",            url: "",   //删除图片的处理URL            data: JSON.stringify({                "delString": deleteValue            }),            contentType: "application/json;charset=utf-8",            dataType: "text",            cache: false,            success: function (text) {            }        });    }

最后补上c#这里的处理部分

        /// <summary>        /// 处理上传字符串保存为图片的方法        /// </summary>        /// <param name="FileString">上传的base64字符串</param>        /// <param name="Angle">拍摄的角度</param>        /// <returns></returns>        [HttpPost]        public string GetUpLoadFileString(string FileString, string Angle)        {            int index = FileString.IndexOf(',');            FileString = FileString.Substring(index + 1);            string p = Server.MapPath("~/Upload/") + DateTime.Now.Year + "" + DateTime.Now.Month + @"/";            if (!Directory.Exists(p))            {                Directory.CreateDirectory(p);            }            try            {                byte[] arr = Convert.FromBase64String(FileString);                MemoryStream ms = new MemoryStream(arr);                Bitmap bmp = new Bitmap(ms);                string SavePath = "/Upload/" + DateTime.Now.Year + "" + DateTime.Now.Month + @"/";                string newFileName = Guid.NewGuid().ToString() + ".jpg";                //根据传递来的参数决定图片的旋转方向                int rorateAngle = int.Parse(Angle);                //顺时针转90度                if (rorateAngle == 6)                {                    bmp.RotateFlip(RotateFlipType.Rotate90FlipNone);                }                //逆时针转90度                if (rorateAngle == 8)                {                    bmp.RotateFlip(RotateFlipType.Rotate270FlipNone);                }                //翻转180度                if (rorateAngle == 3)                {                    bmp.RotateFlip(RotateFlipType.Rotate180FlipNone);                }                //统一将上传的图片存为jpg格式                bmp.Save(p + newFileName, System.Drawing.Imaging.ImageFormat.Jpeg);                //bmp.Save(txtFileName + ".bmp", ImageFormat.Bmp);                //bmp.Save(txtFileName + ".gif", ImageFormat.Gif);                //bmp.Save(txtFileName + ".png", ImageFormat.Png);                ms.Close();                return SavePath + "|" + newFileName;            }            catch (Exception ex)            {                return ex.Message;            }        }