js读取图片分辨率

来源：互联网发布：长绸扇子淘宝编辑：程序博客网时间：2024/04/30 09:57
示例Demo下载地址：http://download.csdn.net/detail/zhaoguoshuai91/9263027
原理：读取图片的元数据，识别图像信息。
缺点：有些图片无图像识别数据的无法识别分辨率。
js部分代码：
<!doctype html><html><head><script type="text/javascript" src="../exif.js"></script></head><body>Upload a local file to read Exif data.<br/><input id="file-input" type="file" /><br/><br/>Click the images to read Exif data. The first image tests reading single tags, while the other two simply show all available data.<br/><br/>Note: these examples will not work if running from a local file:// URL.<br/><br/><img src="DSCN0614_small.jpg" id="img1" /><br/><img src="Bush-dog.jpg" id="img2" /><br/><img src="dsc_09827.jpg" id="img3" /><br/><br/><button id="objecturltest">Object URL Test</button><br/><br/><button id="blobtest">Blob Test</button><br/><br/><button id="base64test">Base64 Test</button><br/><script>document.getElementById("img1").onclick = function() {    EXIF.getData(this, function() {        var make = EXIF.getTag(this, "Make"),            model = EXIF.getTag(this, "Model");        alert("I was taken by a " + make + " " + model);    });}document.getElementById("img2").onclick = function() {    EXIF.getData(this, function() {        alert(EXIF.pretty(this));    });}document.getElementById("img3").onclick = function() {    EXIF.getData(this, function() {        alert(EXIF.pretty(this));    });}document.getElementById("file-input").onchange = function(e) {    EXIF.getData(e.target.files[0], function() {//      alert(EXIF.pretty(this));        alert(JSON.stringify(EXIF.getAllTags(this)));        alert(EXIF.getAllTags(this).PixelXDimension);        alert(EXIF.getAllTags(this).PixelYDimension);    });}document.getElementById("base64test").onclick = function() {    var image = new Image();    image.onload = function() {        EXIF.getData(image, function() {            alert(EXIF.pretty(this));        });    };    image.src = 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= function() {    var http = new XMLHttpRequest();    http.open("GET", "DSCN0614_small.jpg", true);    http.responseType = "blob";    http.onload = function(e) {        if (this.status === 200) {            var image = new Image();            image.onload = function() {                EXIF.getData(image, function() {                    alert(EXIF.pretty(this));                });            };            image.src = URL.createObjectURL(http.response);        }    };    http.send();}document.getElementById("blobtest").onclick = function() {    var http = new XMLHttpRequest();    http.open("GET", "DSCN0614_small.jpg", true);    http.responseType = "blob";    http.onload = function(e) {        if (this.status === 200) {            EXIF.getData(http.response, function() {                alert(EXIF.pretty(this));            });        }    };    http.send();}</script></body></html>
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