js图片上传前检测大小

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直接上代码。

/***desc:上传前检测图片大小 使用案列：<input type="file" onchange="fileChange(this,2*1024*1024);">*author:besttaowenjing@163.com*date:2016-07-01*/var isIE = /msie/i.test(navigator.userAgent) && !window.opera;var sizeLabel = ["B", "KB", "MB", "GB"];function fileChange(target,daxiao) {var fileSize = 0;if (isIE && !target.files) {var filePath = target.value;var fileSystem = new ActiveXObject("Scripting.FileSystemObject"); var file = fileSystem.GetFile (filePath);fileSize = file.Size;} else {fileSize = target.files[0].size;}if(fileSize > daxiao){layer.alert("图片太大");target.value = '';}}function calFileSize(size) {for (var index = 0; index < sizeLabel.length; index++) {if (size < 1024) {return round(size, 2) + sizeLabel[index];}size = size / 1024;}return round(size, 2) + sizeLabel[index];}function round(number, count) {return Math.round(number * Math.pow(10, count)) / Math.pow(10, count);}

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