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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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Summary ×ܽá
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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