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<!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> new document </title>
<meta name="generator" content="editplus" />
<meta name="author" content="" />
<meta name="keywords" content="" />
<meta name="description" content="" />
</head>
<body>
<input type="text" id="txtTest" value="文本框" /><input type="button" id="btnSwitch" value="Switch" />
<script type="text/javascript">
<!--
var $ = document.getElementById;
var DISABLED_TEXT = "禁用";
var btn = $("btnSwitch");
btn.value = DISABLED_TEXT;
var txt = $("txtTest");
btn.onclick = function() {
txt.disabled = (btn.value == DISABLED_TEXT);
btn.value = txt.disabled ? "启用" : DISABLED_TEXT;
};
//-->
</script>
</body>
</html>