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                [new.target](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/new.target "new.target語法由一個關鍵字"new",一個點,和一個屬性名"target"組成。通常"new."的作用是提供屬性訪問的上下文,但這里"new."其實不是一個真正的對象。不過在構造方法調用中,new.target指向被new調用的構造函數,所以"new."成為了一個虛擬上下文。")
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