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                # 生命周期 [TOC] ![](https://box.kancloud.cn/66c835686604f45fc71fbee84aecd50f_1600x1140.png) **關于定時器:** 在有定時器的頁面(特別是有倒計時),離開之前,不管有沒有結束,最好清一下 ``` // 萬金油的操作: componentWillUnmount () { this.setState = (state,callback) => { return; }; } ``` **關于組件:** 自定義的組件都必須用大寫字母開頭,普通HTML標簽用小寫字母開頭;時間屬性名都必須用駝峰命名法;state是讓組件控制自己的狀態,props是讓外部對組件自己進行配置;**組件盡量用無狀態的**
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