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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></title>
</head>
<body>
<input id="chkTest" type="checkbox" checked="checked" />
<input type="button" value="更改" onclick="ChangeCHK()" />
<script type="text/javascript">
var chkTest = document.getElementById("chkTest");
if (chkTest.watch) {
chkTest.watch("checked", function(id, oldval, newval) {
alert(newval);
return newval;
});
}
else {
chkTest.onpropertychange = function() {
alert(this.checked);
}
}
</script>
<script type="text/javascript">
function ChangeCHK() {
var check = chkTest.checked;
chkTest.checked = check == true ? false : true;
}
</script>
</body>
</html>