jsp中實(shí)現(xiàn)上傳圖片即時(shí)顯示效果功能

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>