[vue warn][Avoid mutating a prop directly since the value will be overwritten xx]
翻譯內容：避免直接改變屬性，因爲當父組件重新呈現時，該值將被覆蓋。相反，使用基於屬性值的數據或計算屬性。 原因：子組件不可以直接修改props中傳遞過來的數據。 解決方案：在data中定義一個變量賦值props中的值，然後操作該變量即可。 補充： props屬性值獲取必須在beforeCreate週期之後才能獲取到內容。
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