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demo4:bug:
<h1>多文件上传 之 xhr formdata</h1>
<div>
选择文件(可多选):
<input type="file" id="f1" multiple/><br/><br/>
<button type="button" id="btn-submit">上 传</button>
</div>
var fileList = document.getElementById('f1').files;
console.log(document.getElementById('title'))
if(!fileList.length){
alert('请选择文件');
return;
}
var fd = new FormData(); //构造FormData对象
fd.append('title', document.getElementById('title').value);