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                ``` /* * THIS * 1.給當前元素的某個事件綁定方法, 當事件觸發方法執行的時候, * 方法中的THIS是當前操作的元素對象 * oBox.onclick=function(){ * //=>this:oBox * } * * 2.普通函數執行,函數中的THIS取決于執行的主體, * 誰執行的,THIS就是誰(執行主體:方法執行, * 看方法名前面是否有“點”,有的話,點前面是誰this就是誰,沒有this是window) * function fn(){//=>AAAFFF000 console.log(1); } var obj={ fn:fn //=>fn:AAAFFF000 }; //=>執行的是相同的方法(不同地方在于函數執行方法中的this是不一樣的) obj.fn();//=>this:obj fn();//=>this:window //=>自執行函數執行,方法中的this是window *** ~function(){ //=>this:window }(); */ ``` ![](https://img.kancloud.cn/ec/8f/ec8f44c5432df6cdfc6cdc60dee87081_354x108.png) ``` /* var n = 2; var obj={ n:3, fn:(function (n) { n*=2; this.n+=2; var n=5; return function (m) { this.n*=2; console.log(m + (++n)); } })(n)//=>obj.n會報錯 }; var fn = obj.fn; fn(3);//9 obj.fn(3);//10 console.log(n, obj.n);*/ //8 6 ``` ![](https://img.kancloud.cn/04/cc/04ccdc90f3c58a7e4d1cb72ced455778_712x377.png) ![](https://img.kancloud.cn/7b/9c/7b9c51db42727e48c5070a487ea75303_1547x548.png) ![](https://img.kancloud.cn/f5/97/f5979f9aead1cdeadbdabac26d20c747_499x391.png) ``` ```
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