日期:2014-05-16  浏览次数:20398 次

求助一个js上传文件的怎么写?
求助一个js上传文件的怎么写?

------解决方案--------------------
HTML code

js 用户自定义多文件上传代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>批量上传</title>
<script type="text/javascript">
var attachname = "attach";
var i=1;
function addInput(){
if(i<10){
var attach = attachname + i ;
if(createInput(attach))
i=i+1;
}
} 
function deleteInput(){
if(i>1){
i=i-1;
if(!removeInput())
i=i+1;
}
} 
function createInput(nm){ 
var aElement=document.createElement("div"); 
var html = "附件("+i+")<input type="file" id="FileUpload"
         + i + "" name="FileUpload"
         + i + "" title="选择图片" size="45" onchange="javascript:showphoto();"><br />"
         + "<img  alt="js 用户自定义多文件上传代码"  width="0" id="Image"
         + i + "" name="Image"
         + i + "" src="" title="图片预览" style="margin-left: 55px;" >";
aElement.innerHTML=html;
//aElement.value="thanks"; 
//aElement.onclick=Function("asdf()"); 
if(document.getElementById("upload").appendChild(aElement) == null)
return false;
return true;
} 
function removeInput(nm){
var aElement = document.getElementById("upload");
if(aElement.removeChild(aElement.lastChild) == null)
return false;
return true; 
}
function showphoto(){
  var re=/.(jpg|jpeg|JPG|JPEG)$/;
  var x=document.getElementById('upload').getElementsByTagName('input');
      for(r=0;r<x.length;r++){
  if ((!re.test(document.getElementById("FileUpload"+[r+1]).value)) & (document.getElementById("FileUpload"+[r+1]).value!=""))
  {
   alert("只允许上传jpg文件!");
   document.getElementById("FileUpload"+[r+1]).outerHTML=document.getElementById("FileUpload"+[r+1]).outerHTML.replace(/value=w/g,'');
   document.getElementById("Image"+[r+1]).style.width="0px";
   document.getElementById("Image"+[r+1]).src="";
   }else if (document.getElementById("FileUpload"+[r+1]).value!="")
   {
   document.getElementById("Image"+[r+1]).style.width="100px";
   document.getElementById("Image"+[r+1]).src=document.getElementById("FileUpload"+[r+1]).value;
  }
}
}
function newInput(){
    var x=document.getElementById('upload').getElementsByTagName('img');
      for(r=0;r<9;r++){
    addInput();
    x[r].width="100";
    x[r].src=document.getElementById("smPicture").value.replace("sm","sm"+[r+1]);
  //x[r].onerror=function(){deleteInput()};
    }
}
</script>
<script type="text/javascript">
onload=function(){
newInput();
}
</script>
</head>
<body>
<input type="button" name="button" value="添加附件" onclick="addInput()">
<input type="button" name="button" value="删除附件" onclick="deleteInput()">
<span id="upload"></span>
<input name="smPicture" type="hidden" id="smPicture" value='http://222.70.206.26/img/5/5000011_sm.jpg'>
</body>
</html>

------解决方案--------------------
通过 form 标签,或者 flash
------解决方案--------------------
网上很多的,很容易的,根据你用的服务器端语言下个相应的版本就行了的
------解决方案--------------------