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var num = 1;
var str = num + "";

---

var num = 1;
var str = num.toString();

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ÊýÖµ±ä³ÉÎı¾ x = "" + x;
Îı¾±äÊýÖµ x = 1 * x;
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ÊýÖµ±ä³ÉÎı¾ var x =String(123)
Îı¾±äÊýÖµ x = parseInt(x); »ò x = parseFloat(x);

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HTML code:

<script type="text/javascript" src="http://localhost/mycenter/js/jquery.min.js"></script>
<script>
$("#menu2 li").each(function(){
var reid=$(this).attr("rel");
$(this).hover(function(){
$(this).append(
"<ul class=\""+reid+"\">"+
"{dede:channel type=son typeid="+reid+" row=10}"+
"<li><a href='[field:typelink/]'>[field:typename/]</a></li>"+
"{/dede:channel}"+
"</ul>"
)
});
});

</script>
<div id="menu2">
<ul class="childlist" style="display: none;">

<li