vue组件嵌套组件不显示
使用条件指令 (Using conditional directives)The simplest option is to use the v-if and v-else directives.
最简单的选择是使用v-if和v-else指令。
Here’s an example. The v-if directive checks the noTodos computed property, which returns false if the state property todos contains at least one item:
这是一个例子。 v-if指令检查noTodos计算属性,如果state属性todos包含至少一项,则返回false:
<template> <main> <AddFirstTodo v-if="noTodos" /> <div v-else> <AddTodo /> <Todos :todos=todos /> </div> </main></template><script>export default { data() { return { todos: [], } }, computed: { noTodos() { return this.todos.length === 0 } }}</script>This allows to solve the needs of many applications without reaching for more complex setups. Conditionals can be nested, too, like this:
这样可以解决许多应用程序的需求,而无需进行更复杂的设置。 条件语句也可以嵌套,如下所示:
<template> <main> <Component1 v-if="shouldShowComponent1" /> <div v-else> <Component2 v-if="shouldShowComponent2" /> <div v-else> <Component3 /> </div> </div> </main></template> 使用component Component and is (Using the component Component and is)Instead of creating v-if and v-else structures, you can build your template so that there’s a placeholder that will be dynamically assigned a component.
您可以构建模板,而不是创建v-if和v-else结构,以便有一个占位符将动态分配给组件。
That’s what the component component does, with the help of the v-bind:is directive.
这就是component组件在v-bind:is指令的帮助下所做的事情。
<component v-bind:is="componentName"></component>componentName is a property of the state that identifies the name of the component that we want to render. It can be part of the state, or a computed property:
componentName是状态的属性,用于标识我们要呈现的组件的名称。 它可以是状态的一部分,也可以是计算属性:
<script>export default { data() { return { componentName: 'aComponent', } }}</script>翻译自: https://flaviocopes.com/vue-dynamically-show-components/
vue组件嵌套组件不显示