FormData对象的概述与使用
js中关于Blob对象的介绍与使用
以下是实现代码，本例中后端代码使用php来实现，只是演示基本功能，具体一些文件验证逻辑先忽略。
前端代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>upload</title>
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
</head>
<body>
<input type="file" name="file" id="file">
<button id="upload" onClick="upload()">upload</button>
<script type="text/javascript">
var bytesPerPiece = 1024 * 1024; // 每个文件切片大小定为1MB .
var totalPieces;
//发送请求
function upload() {
var blob = document.getElementById("file").files[0];
var start = 0;
var end;
var index = 0;
var filesize = blob.size;
var filename = blob.name;
//计算文件切片总数
totalPieces = Math.ceil(filesize / bytesPerPiece);
while(start < filesize) {
end = start + bytesPerPiece;
if(end > filesize) {
end = filesize;
}
var chunk = blob.slice(start,end);//切割文件
var sliceIndex= blob.name + index;
var formData = new FormData();
formData.append("file", chunk, filename);
$.ajax({
url: 'http://localhost:9999/test.php',
type: 'POST',
cache: false,
data: formData,
processData: false,
contentType: false,
}).done(function(res){
}).fail(function(res) {
});
start = end;
index++;
}
}
</script>
</body>
</html>
后端php代码：
<?php
header('Access-Control-Allow-Origin:*');
header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept");
$file = $_FILES['file'];
$filename = $file['name'];
file_put_contents($filename, file_get_contents($file['tmp_name']), FILE_APPEND);