<script> 
function setImagePreview() { 
var docObj=document.getElementById("doc"); 
var imgObjPreview=document.getElementById("preview"); 
if(docObj.files && docObj.files[0]){ 
//火狐下，直接設(shè)img屬性 
imgObjPreview.style.display = 'block'; 
imgObjPreview.style.width = '300px'; 
imgObjPreview.style.height = '120px'; 
//imgObjPreview.src = docObj.files[0].getAsDataURL(); 
//火狐7以上版本不能用上面的getAsDataURL()方式獲取，需要一下方式 
imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]); 
}else{ 
//IE下，使用濾鏡 
docObj.select(); 
var imgSrc = document.selection.createRange().text; 
var localImagId = document.getElementById("localImag"); 
//必須設(shè)置初始大小 
localImagId.style.width = "250px"; 
localImagId.style.height = "200px"; 
//圖片異常的捕捉，防止用戶修改后綴來(lái)偽造圖片 
try{ 
localImagId.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)"; 
localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc; 
}catch(e){ 
alert("您上傳的圖片格式不正確，請(qǐng)重新選擇!"); 
return false; 
} 
imgObjPreview.style.display = 'none'; 
document.selection.empty(); 
} 
return true; 
} 
</script> 
<body> 
<input type=file name="doc" id="doc" onchange="javascript:setImagePreview();"> 
<p><div id="localImag"><img id="preview" width=-1 height=-1 style="diplay:none" /></div></p>