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熟悉 Vue ？你能解释这个死循环吗？
source link: https://juejin.im/post/5b8a18f36fb9a019bf46bd65
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====== 更新线 ===== 评论区有了相关讨论，贴更详细一点的解释出来 ====== 更新线 ===== 循环出现的条件： key="Math.random()" 子组件在 created 中输出计算属性并改变 data 与 Vue watcher
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