HTML文件上传与进度显示-优快云博客

<!DOCTYPE html>  
<html lang="en">  
<head>  
    <meta charset="UTF-8">  
    <title>Document</title>  
</head>  
<body>  
<div style="width:500px;height:20px;border:1px solid gray"><div id="prog" style="height:100%;width:0%;background:blue;"></div></div>  
  
<form action="12.php" method="post" enctype="multipart/form-data" target="frm">  
    <p><input type="file" name="pic" id=""></p>  
    <p><input type="text" name="username" id=""></p>  
    <p><input type="submit" value="提交"></p>  
</form>  
<iframe src="12.php" name="frm"></iframe>      
</body>  
<script>  
var fm = document.getElementsByTagName('form')[0];  
fm.onsubmit = function() {
    var fmdata = new FormData(this); // FormData会把表单的数据(包括文件),整体打包  

    var xhr = new XMLHttpRequest();
    xhr.onreadystatechange = function() {
        if(this.readyState == 4) {
            alert(this.responseText);
        }
    }  
  
    //此处监听上传进度  
    xhr.upload.onprogress = function(ev) {
        if(ev.lengthComputable) {
            var per = 100* ev.loaded/ev.total;
            document.getElementById('prog').style.width = per + '%';
        }
    }  
    //上传文件  
    xhr.open('post' , '12-2.php' , true);  
    xhr.send(fmdata);  
  
    return false;  
}  
  
alert('南京');  
alert(encodeURI('南京'));  
</script>  
</html>

echo move_uploaded_file($_FILES['pic']['tmp_name'], './xx.mp4') ? 'ok' : 'fail';  //服务端代码

用ajax 上传文件