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2. Ëüʵ¼ÊÖ¸functionËù¹ØÁªµÄ¶ÔÏó£¬Èç¹ûfunctionûÓйØÁªÈκζÔÏó£¬ÔòthisÊÇGlobal¶ÔÏó
var msg = 'I am global';
function showMsg(){
alert(this.msg);
};
function nestedShowMsg (){
var nested = function(){
alert(this.msg);
};
nested(); 
};
var owner = {msg:'I am local'};
owner.showMsg = showMsg;
owner.nestedShowMsg = nestedShowMsg;
showMsg();  //should be 'I am global'
owner.showMsg(); //should be 'I am local'
owner.nestedShowMsg();should be 'I am global'


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<script>
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function isNumeric(strNumber) {
var newPar=/^(-|\+)?\d+(\.\d+)?$/
alert(newPar.test(strNumber)); }
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/**  
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*/  
String.prototype.trim=function(){      
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1.function f(x){return x*x;};f(x);
2.(function(x){return x*x;})(x);
3.(function(x){return x*x;}(x));
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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>
<meta http-equiv="Content-Type" conte ......
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