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                [TOC] * Javascript的函數也是對象,它有三種方法可以改變函數內部this關鍵字的指向。 ## 1.bind ``` var wang = { name:"娟娟娟" } var apple = function(){ console.log(this.name); }.bind(wang); apple(); ``` ## 2.call ``` 語法:call(thisObj,params) //第一個參數指向函數內部的this,之后的參數是需要被傳入函數的參數 ``` ``` function sayName(label) { console.log(label + ":" + this.name); } var name = "window"; var cheng = { name: "cheng" }; var jiang = { name: "jiang" }; sayName.call(this,"window"); sayName.call(cheng,"cheng"); sayName.call(cheng,"cheng"); ``` > 功能 1.改變函數內部this關鍵字的指向 2.可以讓對象擁有一個它沒有的方法 ``` var cheng = { name:"cheng", say(){ console.log("喜歡吃面") } } var jiang ={}; cheng.say.call(jiang); ``` ## 3.apply() > 語法:apply(thisObj,[params]) ``` var cheng = { name:"cheng" } var jiang = { name:"jiang", sayName(a,b){ console.log(this.name); console.log(a+b); } } jiang.sayName.apply(cheng,[1,2]) ```
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