实现代码如下：
<!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>js图片上传预览</title>
<script language="javascript" type="text/javascript">
function $(obj){
return document.getElementById(obj);
}
window.onload = function(){
$("file1").onchange = function(){
this.select();
$("img1").src = "file:///"+document.selection.createRange().text;
}
}
</script>
</head>
<body>
<form name="form1">
<input type="file" name="file1" id="file1" />
</form>
<img src="#" id="img1" />
</body>
</html>
保存到本地.htm格式，即可
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