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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script src="jquery-1.4.3.min.js"></script>
<script type="text/javascript">
//基本函数*2
var addHandler = window.addEventListener?
function(elem,event,handler){elem.addEventListener(event,handler);}:
function(elem,event,handler){elem.attachEvent("on"+event,handler);};
var $ = function(id){return document.getElementById(id);}
function autoTextArea(elemid){
//新建一个textarea用户计算高度
if(!$("_textareacopy")){
var t = document.createElement("textarea");
t.id="_textareacopy";
t.style.position="absolute";
t.style.left="-9999px";
document.body.appendChild(t);
}
function change(){
$("_textareacopy").value= $(elemid).value;
$(elemid).style.height= $("_textareacopy").scrollHeight+$("_textareacopy").style.height+"px";
}
addHandler($("target"),"propertychange",change);//for IE
addHandler($("target"),"input",change);// for !IE
$(elemid).style.overflow="hidden";//一处隐藏，必须的。
$(elemid).style.resize="none";//去掉textarea能拖拽放大/缩小高度/宽度功能
}
addHandler(window,"load",function(){
autoTextArea("target");
});
</script>
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<body>
<textarea id="target" rows="" cols=""></textarea>
</body>
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