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                函數的this,其實就是執行環境,常常都在用,但是非常的重要,如改變this指向實現繼承,閉包等都會涉及到執行環境的問題。 下面這個會輸出什么哇 ![](https://box.kancloud.cn/535999da9f09af23027f896f3819d262_352x347.png) 答案是 jero henry this的值是不確定的,因為執行環境是在變化的,this的值只有這個調用的時候才會確定。
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