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function loadscript(url) {
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}
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function
matchDemo(){
   var s;
   var re = new RegExp("d(b+)(d)","ig");
 
 var str = "cdbBdbsbdbdz";
   var arr = re.exec(str);
   s = "$1
contains: " + RegExp.$1 + "\n";
   s += "$2 contains: " + RegExp.$2 +
"\n";
   s += "$3 contains: " + RegExp.$3;
   return(s);
}


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[·­Òë]High Performance JavaScript(033)

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    When web pages or applications begin to feel slow, analyzing assets as they come over the wire and profiling scripts while they are running allows you to focus your optimization efforts where they are needed most.
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3 location=location 
4 location.assign(location) 
5 location.replace(location) 
6 from..reset()  (Ò³Ãæ²»½øÐÐˢУ¬Ä£Äâµ¥»÷¶ÔËùµ÷ÓÃ±íµ¥ÖØÖð´Å¥µÄµ¥»÷)
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1.function f(x){return x*x;};f(x);
2.(function(x){return x*x;})(x);
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