js大文件分割上传

Posted 2020-06-19

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="zh-CN">
<head>
<title>分割大文件上传</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style>
    #test{
        width: 200px;
        height: 100px;
        border: 1px solid green;
        display: none;
    }
    #img{
        width: 50px;
        height: 50px;
        display: none;
    }
    #upimg{
        text-align: center;
        font: 8px/10px ‘微软雅黑‘,‘黑体‘,sans-serif;
        width: 300px;
        height: 10px;
        border: 1px solid green;
    }
    #load{
        width: 0%;
        height: 100%;
        background: green;
        text-align: center;
    }
</style>
</head>
    <body>
        <form enctype="multipart/form-data" action="file.php" method="post">
            <!-- 
            <input type="file" name="pic" />
            <div id="img"></div>
            <input type="button" value="uploadimg" onclick="upimg();" /><br />
            -->
            <div id="upimg">
                <div id="load"></div>
            </div>
            <input type="file" name="mof" multiple="multiple"/>
            <input type="button" value="uploadfile" onclick="upfile();" />
            <input type="submit" value="submit" />
        </form>
        <div id="test">
            测试是否DIV消失
        </div>
<script type="text/javascript">
    var dom=document.getElementsByTagName(‘form‘)[0];
    dom.onsubmit=function(){
        //return false;
    }
    var xhr=new XMLHttpRequest();
    var fd;
    var des=document.getElementById(‘load‘);
    var num=document.getElementById(‘upimg‘);
    var file;
    const LENGTH=10*1024*1024;
    var start;
    var end;
    var blob;
    var pecent;
    var filename;
    //var pending;
    //var clock;
    function upfile(){
        start=0;
        end=LENGTH+start;
        //pending=false;

        file=document.getElementsByName(‘mof‘)[0].files[0];
        //filename = file.name;
        if(!file){
            alert(‘请选择文件‘);
            return;
        }
        //clock=setInterval(‘up()‘,1000);
        up();

    }

    function up(){
        /*
        if(pending){
            return;
        }
        */
        if(start<file.size){
            xhr.open(‘POST‘,‘file.php‘,true);
            //xhr.setRequestHeader(‘Content-Type‘,‘application/x-www-form-urlencoded‘);
            xhr.onreadystatechange=function(){
                if(this.readyState==4){
                    if(this.status>=200&&this.status<300){
                        if(this.responseText.indexOf(‘failed‘) >= 0){
                            //alert(this.responseText);
                            alert(‘文件发送失败，请重新发送‘);
                            des.style.width=‘0%‘;
                            //num.innerHTML=‘‘;
                            //clearInterval(clock);
                        }else{
                            //alert(this.responseText)
                            // pending=false;
                            start=end;
                            end=start+LENGTH;
                            setTimeout(‘up()‘,1000);
                        }

                    }
                }
            }
            xhr.upload.onprogress=function(ev){
                if(ev.lengthComputable){
                    pecent=100*(ev.loaded+start)/file.size;
                    if(pecent>100){
                        pecent=100;
                    }
                    //num.innerHTML=parseInt(pecent)+‘%‘;
                    des.style.width=pecent+‘%‘;
                    des.innerHTML = parseInt(pecent)+‘%‘
                }
            }
　　　　　　　
　　　　　　　//分割文件核心部分slice
            blob=file.slice(start,end);
            fd=new FormData();
            fd.append(‘mof‘,blob);
            fd.append(‘test‘,file.name);
            //console.log(fd);
            //pending=true;
            xhr.send(fd);
        }else{
            //clearInterval(clock);
        }
    }

    function change(){
        des.style.width=‘0%‘;
    }
    
</script>
    </body>
</html>

file.php:

<?php 
/****
    waited
****/
//print_r($_FILES);exit;

$file = $_FILES[‘mof‘];

$type = trim(strrchr($_POST[‘test‘], ‘.‘),‘.‘);

// print_r($_POST[‘test‘]);exit;

if($file[‘error‘]==0){
    if(!file_exists(‘./upload/upload.‘.$type)){
        if(!move_uploaded_file($file[‘tmp_name‘],‘./upload/upload.‘.$type)){
            echo ‘failed‘;
        }
    }else{
        $content=file_get_contents($file[‘tmp_name‘]);
        if (!file_put_contents(‘./upload/upload.‘.$type, $content,FILE_APPEND)) {
            echo ‘failed‘;
        }
    }
}else{
    echo ‘failed‘;
}

?>