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This article mainly introduces how to implement the technology of uploading large files in HTML5. I would like to share it with you for your reference.
The code is as follows:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <div> <div> 添加文件 <input type="file" name="" id="fileinput"> </div> <progress value="0" max="100" style='width:500px;margin-top:20px'></progress> <div style='margin-top:20px'> <span id="handler_info" ></span> </div> </div> <script src="Scripts/spark-md5.js"></script> <script> function get_filemd5sum(ofile) { var file = ofile; var tmp_md5; var blobSlice = File.prototype.slice || File.prototype.mozSlice || File.prototype.webkitSlice, // file = this.files[0], chunkSize = 2 * 1024 * 1024, // Read in chunks of 2MB chunks = Math.ceil(file.size / chunkSize), currentChunk = 0, spark = new SparkMD5.ArrayBuffer(), fileReader = new FileReader(); fileReader.onload = function(e) { // console.log('read chunk nr', currentChunk + 1, 'of', chunks); spark.append(e.target.result); // Append array buffer currentChunk++; var md5_progress = Math.floor((currentChunk / chunks) * 100); console.log(file.name + " 正在处理,请稍等," + "已完成" + md5_progress + "%"); var handler_info = document.getElementById("handler_info"); var progressbar = document.getElementsByClassName("progressbar")[0]; handler_info.innerHTML=file.name + " 正在处理,请稍等," + "已完成" + md5_progress + "%" progressbar.value =md5_progress; if (currentChunk < chunks) { loadNext(); } else { tmp_md5 = spark.end(); console.log(tmp_md5) handler_info.innerHTML = file.name + "的MD5值是:" + tmp_md5; } }; fileReader.onerror = function() { console.warn('oops, something went wrong.'); }; function loadNext() { var start = currentChunk * chunkSize, end = ((start + chunkSize) >= file.size) ? file.size : start + chunkSize; fileReader.readAsArrayBuffer(blobSlice.call(file, start, end)); } loadNext(); } var uploadfile = document.getElementById('fileinput') uploadfile.onchange = function(e){ var file = this.files[0]; if(!file) { alert('请选择文件!'); return false; } get_filemd5sum(file) } </script> </body> </html>
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