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                ### 6. this javascript的頂級作用域是window, 全局變量是window的屬性,函數是window的方法 this的指向: 1. 在事件中,this指向正在執行事情的當前對象 2. 在方法中,誰調用方法,this指向誰 ``` var a= 10; //window.a=10 function b(){ console.log(this.a); } b(); //window.b(); //console.log(window.a) ```
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