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我正在使用JavaScript来生成唯一文件值的文件哈希值。请检查下面的代码，以了解效果良好的哈希生成机制。

<script type="text/javascript">
// Reference: https://code.google.com/p/crypto-js/#MD5
function handleFileSelect(evt) 
{   
    var files = evt.target.files; // FileList object
    // Loop through the FileList and render image files as thumbnails.
    for (var i = 0, f; f = files[i]; i++) 
    {
        var reader = new FileReader();
        // Closure to capture the file information.
        reader.onload = (function(theFile) 
        {
            return function(e) 
            {
                var span = document.createElement('span');
                var test = e.target.result;                 
                //var hash = hex_md5(test);
                var hash = CryptoJS.MD5(test);
                var elem = document.getElementById("hashValue");
                elem.value = hash; …