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                >[success] # 訪問對象參數兩種方式 ~~~ 1.訪問對象參數一般情況下使用點的形式 2.當想通過變量的形式訪問對象中的參數使用'[]' 3.如果訪問參數中有包含'錯誤字符','關鍵字' 使用'[]' 4.書中建議除非是上面兩種特殊情況否則最好使用點 ~~~ >[danger] ##### 對[]詳細說明 * 變量key ~~~ personInfo = { name: 'wang', age: '18' } let key = 'name' console.log(personInfo[key]) // wang ~~~ * 錯誤字符(中間變量有空格,點百分會報錯的只能用[]) ~~~ personInfo = { name: 'wang', age: '18' } personInfo['wrong string'] = '錯誤字符串' console.log(personInfo) 打印結果: {name: "wang", age: "18", wrong string: "錯誤字符串"} ~~~
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