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js 图片上传前大小长宽验证代码

  作者：bea

脚本如下： <html> <head> <script language="javascript" type="text/javascript"> function getimginfo() { var img=new Image(); img.src=document.all.file.value; var sInfo="Width:"+img.width+ "px Height:"+img.height+ "px Size:"+get
脚本如下：



<html>
<head>
<script language="javascript" type="text/javascript">
function getimginfo()
{
var img=new Image();
img.src=document.all.file.value;
var sInfo="Width:"+img.width+
"px Height:"+img.height+
"px Size:"+getsizestring(img.fileSize);
alert(sInfo);
}
function getsizestring(len)
{
var kb=len/1024;
if(kb<1024)
return kb.toFixed(2)+"K";
else
{
var m=kb/1024;
return m.toFixed(2)+"M";
}
}
</script>
</head>
<body>
<table width="90%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td>
<img width="60" height="60" id="picdemo">
</td>
<td>
<input type="file" id="file" onchange="document.all.picdemo.src=this.value" class="allinput"> 
<input type="submit" name="Submit" value="上传" onClick="getimginfo();">
</td>
</tr>
</table>
</body>
</html>




[Ctrl+A 全选 注:
如需引入外部Js需刷新才能执行]



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