我的需求：多个页面顶部共用一个组件topBar，topBar内有"首页"按钮，点击可返回到首页，想做成当前页为首页时，不显示这个按钮，其他则显示。
原topBar:
其他组件:
发现报错 : The data property "isHome" is already declared as a prop. Use prop default value instead.
解决方法: 去掉子组件topBar的data里的isHome即可
vue——子组件报错：The data property "isHome" is already declared as a prop. Use prop default value instead.
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