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                作用域是指程序源代碼中定義變量的區域 作用域規定了如歌查找變量,也就是確定當前執行代碼對變量的訪問權限 JavaScript采用詞法作用域,也就是靜態作用域 ~~~ var name='xiaozhang'; function foo() { console.log(name) } function bar() { var name='zhanglei' foo(); } bar(); //xiaozhang ~~~ foo 函數檢查是否有局部變量name 如果沒有,就上一層找
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