效果图：
代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<form method="POST" enctype="multipart/form-data" onsubmit="return false;" >
<input id=file type=file placeholder="select a file" />
</form>
<pre id=log></pre>
<script src="js/spark-md5.min.js"></script>
<script>
var log=document.getElementById("log");
document.getElementById("file").addEventListener("change", function() {
var blobSlice = File.prototype.slice || File.prototype.mozSlice || File.prototype.webkitSlice,
file = this.files[0],
chunkSize = 2097152, // read in chunks of 2MB
chunks = Math.ceil(file.size / chunkSize),
currentChunk = 0,
spark = new SparkMD5.ArrayBuffer(),
frOnload = function(e){
// log.innerHTML+="\nread chunk number "+parseInt(currentChunk+1)+" of "+chunks;
spark.append(e.target.result); // append array buffer
currentChunk++;
if (currentChunk < chunks)
loadNext();
else
log.innerHTML+="\n加载结束 :\n\n计算后的文件md5:\n"+spark.end()+"\n\n现在你可以选择另外一个文件!\n";
},
frOnerror = function () {
log.innerHTML+="\糟糕，好像哪里错了.";
};
function loadNext() {
var fileReader = new FileReader();
fileReader.onload = frOnload;
fileReader.onerror = frOnerror;
var start = currentChunk * chunkSize,
end = ((start + chunkSize) >= file.size) ? file.size : start + chunkSize;
fileReader.readAsArrayBuffer(blobSlice.call(file, start, end));
};
loadNext();
});
</script>
</body>
</html>个人收藏的相关资料链接：
