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Understanding of this object

2022-07-25 15:38:00 【Gorgio_ Liu】

1、this Always point to the direct caller of the function （ Not the indirect caller ）
2、 If there is new keyword ,this Point to new The object who came out
3、 In the event ,this Point to the object that triggered the event , What is special is ,IE Medium attachEvent Medium this Always point to global objects Window

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