<formname="form5"id="form5"method="post"action="#">
<inputtype="file"name="file5"id="file5"onchange="preview5()"/>
</form>
<scripttype="text/javascript">
functionpreview5(){
varx=document.getElementById("file5");
if(!x||!x.value)return;
varpatn=/\.jpg$|\.jpeg$|\.gif$/i;
if(patn.test(x.value)){
vary=document.getElementById("img5");
if(y){
y.src="file://localhost/"+x.value;
}else{
varimg=document.createElement("img");img.setAttribute("src","file://localhost/"+x.value);
img.setAttribute("width","120");
img.setAttribute("height","90");
img.setAttribute("id","img5");
document.getElementById("form5").appendChild(img);
}
}else{
alert("您选择的似乎不是图像文件。");
}}
</script>