凌晨遇到一個控制台報錯的信息，總是顯示有對象中的元素未定義
明明是有把定義對象的值的，后面發現是把沒有返回值的函數又賦值一遍給未定義的元素所屬的對象，😓 😳
此函數沒有返回值：
原因，是因為將沒有返回值的函數賦值給元素未定義的對象了
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