update
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@@ -251,9 +251,17 @@ const routes= [
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```
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3.组件内的 导航守卫
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在组件内的 导出模块中声明
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beforeRouteEnter,beforeRouteUpdate,beforeRouteLeave
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参数都是 from,to,next
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beforeRouterEnter: 进入该组件的时候调用
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beforeRouteUPdate :路由改变呢重用组件的时候调用
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beforeRouteLeave :
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beforeRouteLeave : 离开该组件的时候调用
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eg
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