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並前往https://qastack.cn/programming/35107211/in-angular-2-how-to-check-whether-ng-content-is-empty

在Angular 2中如何检查是否为空？

ng -content像这样包装HTML元素div以获取对其的本地引用，然后将ngIf表达式绑定 ... <div class="wrapper"> <ng-content select="my-component"></ng-content> </div> ...

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