js实现分割上传大文件
编程学习 2021-07-04 21:04www.dzhlxh.cn编程入门
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本文实例介绍了js上传文件操作，分享给大家供大家参考，具体内容如下
<!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';
}
?>
1 运行：
2 选择2G文件测试:
3 完成并正常播放:
以上就是本文的全部内容，希望对大家的学习有所帮助。