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                ~~~ /* * 變量提升: * function fn; */ // console.log(fn);//=>undefined if (1 === 1) { console.log(fn);//=>函數本身:當條件成立, 進入到判斷體中(在ES6中它是一個塊級作用域) 第一件事并不是代碼執行,而是類似于變量提升一樣, 先把FN聲明和定義了,也就是判斷體中代碼執行之前, FN就已經賦值了 function fn() { console.log('ok'); } } // console.log(fn);//=>函數本身 ~~~ ~~~ console.log(fn);//=>undefined if (1 === 2) { console.log(fn); function fn() { console.log('ok'); } } console.log(fn);//=>undefined ~~~
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