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                ## 普通調用 this指向window. ``` function fn(){ } fn(); ``` ## 方法調用 this指向調用的對象 ``` var obj = { fn:function(){ } } obj.fn() ``` ## 構造函數 this指向調用的對象. ## 事件的處理函數 this指向觸發該事件的對象. 事件的處理函數 ## 定時器的參數 this指向的是window.因為是由window來調用該定時器的. ``` setInterval(() => { }, interval); ``` # 總結 函數內部的this,是由函數調用的時候來確定其指向的.
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