爪哇之家

<input type="file" name="file1" style="width:300'" class="tx1" value="" onchange="PreviewImg(this);">
?
?<div style="width:400px;height:300px;border:1px solid #aaaaaa;overflow:auto" id="previewDiv">
?</div>
<script language="javascript">

function PreviewImg(obj){
? var div = document.getElementById("previewDiv");
? if(obj.value=="" || div.childNodes.length>0){
??? div.removeChild(div.firstChild);
??? if(obj.value=="")return;
? }
? var ext = obj.value.substring(obj.value.lastIndexOf(".")+1)
? div.appendChild(getFlash(obj.value,ext));
}
function getFlash(src,ext){
?var img;
?switch(ext.toLowerCase()){
??case "jpg":
??case "jpeg":
??case "bmp":
??case "gif":
??case "png":
???img = document.createElement("img");
???break;
??case "swf":
???img = document.createElement("embed");
???img.type="application/x-shockwave-flash";
???img.width=400;
???img.height=300;
???break;
?}
?img.src=src;
?return img;
}
</script>