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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>$.ajax文件分块上传</title>
</head>
<body>
<p>在 demo4.html 的基础上改为，可以分块连续上传整个文件。</p>
<form action="upload.php">
<input type="file" id="file">
</form>
<script src="jquery-1.11.0.js"></script>
<script>
~function($){
// 每次上传文件的一段，单位：字节
var preUploadSize = 1024 * 2
var start = 0
var xhr = new XMLHttpRequest()
var total = 0
$('#file').change(function() {
var files = this.files
var file = files[0]
upload(file)
})
function upload(file) {
var data = new FormData()
data.append("name", encodeURIComponent(file.name))
data.append("file", file.slice(start, start + preUploadSize))
$.ajax({
type: 'POST',
url: 'upload.php',
data: data,
// 设置 false 以使用文件上传的 Content-Type
// 如 Content-Type:multipart/form-data; boundary=----WebKitFormBoundarykdtBZ0dnFQOWcXu3
contentType: false,
// 避开jQuery对 data 对象的默认处理
processData: false,
// 设置 xhr 对象，增加 onprogress 事件
xhr: function() {
var xhr = $.ajaxSettings.xhr();
xhr.upload.onprogress = function(e) {
total += e.loaded
document.title = '上传 ' + total + ' 字节'
}
return xhr
}
}).then(function() {
start += preUploadSize
if (start < file.size) {
// 在 demo4.html 的基础上改为，可以分块连续上传整个文件。
upload(file)
} else {
alert('上传结束')
}
}, function() {
alert('上传错误')
})
}
}(jQuery)
</script>
</body>
</html>