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                - 從根本上防止屬性名的沖突,這就是 ES6 引入Symbol的原因 - 它是一種類似于字符串的數據類型,Symbol函數前不能使用new命令,否則會報錯。這是因為生成的 Symbol 是一個原始類型的值,不是對象 - Symbol 值作為對象屬性名時,不能用點運算符
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