Learn to use v-show to switch templates

Question

I'm trying to use v-show or v-if to toggle the display of the template as shown in the code below.

The problem I'm facing is that although v-show is not a lazy condition, when I set showTemplate to false or true, msg The content is always displayed.

Please tell me how to use v-show and v-if correctly.

helloWorld：

<template v-show="showTemplate">
  <div class="hello">
  {{msg}}
  </div>
</template>

<script>
export default {
  name: 'HelloWorld',
  props: {
    msg: String
  }
}
</script>

<script setup>
    import { ref } from 'vue'
    let showTemplate = ref(true)
    showTemplate.value=false
</script>

app:

template>
  <img alt="Vue logo" src="./assets/logo.png">
  <HelloWorld msg="欢迎使用Vue.js应用程序"/>
</template>

<script>
import HelloWorld from './components/HelloWorld.vue'
export default {
  name: 'App',
  components: {
    HelloWorld
  }
}
</script>

<script setup>


</script>

Answer 1

You must use it like this:

<template>
  // v-show或v-if都可以
  <div v-show="showTemplate" class="hello">
  {{msg}}
  </div>
</template>

<script>
export default {
  name: 'HelloWorld',
  props: {
    msg: String
  }
}
</script>

<script setup>
    import { ref } from 'vue'
    let showTemplate = ref(true)
    showTemplate.value=false
</script>

Because v-if or v-show cannot be used with the template attribute.