<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>html5文件上传</title>
</head>
<body>
<input type="file" name="file" id="file" />
<br/>
<input type="submit" value="提交" id="submit" />
<script>
var fileinput=document.getElementById('file');
var btn=document.getElementById('submit');
btn.onclick=function(){
var file=fileinput.files[0];
var formdata=new FormData();
formdata.append('file',file);
var xhr=new XMLHttpRequest();
xhr.open("POST",'upload.php',true);
xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
xhr.upload.addEventListener("progress",function(e){
document.title= e.loaded/ e.total;
},false)
xhr.addEventListener("load", function(e){
alert(e.target.responseText);
}, false);
xhr.onreadystatechange=function(){
console.log(xhr.readyState)
}
xhr.send(formdata)
}
</script>
</body>
</html>
