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  • 转载:js判断上传文件的大小


    <!DOCTYPE html>
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>js判断上传文件的大小</title>
    <script type="text/javascript">
    var isIE = /msie/i.test(navigator.userAgent) && !window.opera;
    var sizeLabel = ["B", "KB", "MB", "GB"];
    function fileChange(target) {
    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;
    }
    displayFileSize(fileSize);
    }

    function displayFileSize(size) {
    var fileSize = document.getElementById("fileSize");
    fileSize.innerHTML = calFileSize(size);
    }

    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);
    }
    </script>
    </head>
    <body>
    <div>
    <input type="file" onchange="fileChange(this);">
    </div>
    <div id="fileSize">
    </div>
    </body>
    </html>

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  • 原文地址:https://www.cnblogs.com/wzq806341010/p/2872236.html
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