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                ### 1、重置vue中data的數據,不用一個個地重新寫一遍 ```javascript Object.assign(this.$data,?this.$options.data())/*重置vue中的data*/ ``` 這里?this.$options.data()就是初始化的那個data數據 ### 2、數組判空,為null或者undefined的時候為0 ``` _.size(this.cellLines) > 2 ``` ### 3、判空,避免多級判斷,或者為null的情況,導致第三個參數不生效 ``` _.get(obj, 'a.b.c') || 0 ```
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