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<script language="javascript" type="text/javascript">
var num = 0;
function AddNum() {
num++;
document.getElementById("txtNum").value = num;
if (num >= 10) {
alert("结束");
}
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setTimeout("AddNum()", 500);
}
}
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<input type="text" id="txtNum" /><input type="button" value="累加" onclick="AddNum()" />
<script type="text/javascript">
var counter = function() {
if(typeof this.num == 'undefined') {
this.num = 0;
}
this.num++;
return this.num;
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alert(counter());
alert(counter());
alert(counter());
</script>