<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8"/>
<title>xhr2</title>
</head>
<body>
<div style="text-align:center;margin:100px">
<input type="file" id="file" name="file" multiple="multiple">
<button onclick="xhr2()">多文件上传</button>
</div>
<script>
function xhr2(){
var xhr = new XMLHttpRequest();//第一步
//定义表单变量
var file = document.getElementById('file').files;
//console.log(file.length);
//新建一个FormData对象
var formData = new FormData(); //++++++++++
//追加文件数据
for(i=0;i<file.length;i++){
formData.append("file["+i+"]", file[i]); //++++++++++
}
//formData.append("file", file[0]); //++++++++++
//post方式
xhr.open('POST', 'xhr2.php'); //第二步骤
//发送请求
xhr.send(formData); //第三步骤
//ajax返回
xhr.onreadystatechange = function(){ //第四步
if ( xhr.readyState == 4 && xhr.status == 200 ) {
console.log( xhr.responseText );
}
};
//设置超时时间
xhr.timeout = 100000;
xhr.ontimeout = function(event){
alert('请求超时！');
}
}
</script>
</body>
</html>