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let res = (是否有childVal,判断组件的选项中是否有对应名字声明周期钩子)?如果有判断是否有parentVal?如果有将二者合并一个数据:如果没有判断childVal 是不是一个数组?如果childVal是一个数组直接返回:如果不是作为数组的元素然后返回:如果没有childVal直接返回parentVal
首先要了解声明周期的合并策略,
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