<html>
<head>
<title>test upload picture</title>
<script language="javascript">
function testviewpic(mypic,imgfilepath)
{
var myflag=0; //进行筛选的图片的扩展名
var aa = ".gif|.jpg|.jpeg|.bmp|.png"; //分离出可以通过的图片扩展名
var bb = aa.split('|'); //进行循环判断，路经是否为图片
for(var i=0;i<bb.length;i++)
{
//检索路径是否含有指定图片的扩展名
var cc = imgfilepath.value.toLowerCase().indexOf(bb[i]);
if (cc > 0)
{
//当图片的路经中含有指定的扩展名时，对状态进行赋值
myflag=1; mypic.src=imgfilepath.value; mypic.style.display=""; mypic.border=1; break;
}
}
//如果状态为错误，弹出信息框
if(myflag == 0)
{
alert("current path not picture"); //清除上传框的路径值
imgfilepath.outerHTML = imgfilepath.outerHTML; imgfilepath.value=""; mypic.src=""; mypic.style.display="none";
}
}
</script>
</head>
<body>
<form id="form1">
<table>
<tr>
<td class="tdLeft">图片上传：</td>
<td><INPUT id="img_upload" type="file" runat="server" onchange="testviewpic(showimg,this.form.img_upload);"> </td> </tr>
<tr> <td class="tdLeft"></td> <td><img id="showimg" alt="" src="" style="display:none"></td> </tr> </table>
</form>
</body>
</html>