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目的：自由控制文字框不能被客戶改變（只能通過指令碼來改變值），或者可以被客戶自由改變。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title></title>
<script>
function $(id) {
return document.getElementByIdx_x(id);
}
function empty()
{ }
</script>
</head>
<body>
姓名：<input type="text" onfocus="this.blur()" onchange="if(this.title) this.value=this.title" title="" onselect="this.title=this.value;" id="tt" /><input type="button" value="設定" onclick="this.previousSibling.value='通過按鈕設定得'" />
<input type="button" value="改變" onclick="$('tt').onfocus=empty;$('tt').onchange=empty;$('tt').onselect=empty;$('tt').setAttribute('title','empty')" />
<input type="button" value="擷取" onclick="alert($('tt').getAttribute('title'))" />
</body>
</html>
缺點：1.借用了title屬性
2.可能存在其它的bugg
優點：這樣設定（作為代替readOnly、disabled的屬性的方法修補），可以被.net後台擷取到值。
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