上传图片之前判断大小的解决办法（利用IE漏洞）

<script>

var img=null;

function s()

{

if(img)img.removeNode(true);

img=document.createElement("img");

img.style.position="absolute";

img.style.visibility="hidden";

img.attachEvent("onreadystatechange",orsc);

img.attachEvent("onerror",oe);

document.body.insertAdjacentElement("beforeend",img);

img.src=inp.value;

}

function oe()

{

alert("cant load img");

}

function orsc()

{

if(img.readyState!="complete")return false;

alert("图片大小："+img.offsetWidth+"X"+img.offsetHeight);

alert("图片尺寸："+img.fileSize);

btn.disabled=false;

}

</script>

<input id=inp type="file">

<br/>

<button onclick="s()">Test</button><button id=btn disabled>UpLoad</button>