1 模板插值语法

<template>
  {{ message }}
    {{ message2==0 ? '我是老大' : '我笑的' }}
    {{ message2 + 1 }}
    {{ message.split('').map(v => `4546$v`) }}
</template>
<script setup lang="ts">
const message = "我是唐少"
const message2:number = 1
</script>
<style>
</style>    

2 指令

v-on修饰符 冒泡案例:

<template>
<div @click="parent">parent
<div @click.stop="child">child</div>
</div>
</template>
<script setup lang="ts">
const child = () => {
console.log('child');
// 点击后不会答应parent,因为被阻止了
}
const parent = () => {
console.log('parent');
}
</script>

阻止表单提交案例:

<template>
<form action="/">
<button @click.prevent="submit" type="submit">submit</button>
</form>
</template>
<script setup lang="ts">
const submit = () => {
console.log('child');
}
</script>
<style>
</style>

v-bind 绑定class 案例 1:

<template>
<div :class="[flag ? 'active' : 'other', 'h']">456789</div>
</template>
<script setup lang="ts">
const flag: boolean = false;// 改成true后切换不同的效果
</script>
<style>
.active {
color: red;
}
.other {
color: blue;
}
.h {
height: 300px;
border: 1px solid #ccc;
}
</style>

v-bind 绑定class 案例 2:

<template>
<div :class="flag">{{flag}}</div>
</template>
// 直接绑定cls
<script setup lang="ts">
type Cls = {
other: boolean,
h: boolean
}
const flag: Cls = {
other: false,
h: true
};
</script>
<style>
.active {
color: red;
}
.other {
color: blue;
}
.h {
height: 300px;
border: 1px solid #ccc;
}
</style>

v-bind 绑定style案例:

<template>
<div :style="style">绑定style</div>
</template>
<script setup lang="ts">
type Style = {
height: string,
color: string
}
const style: Style = {
height: "300px",
color: "blue"
}
</script>
<style>
</style>

v-model 案例:

<template>
<input v-model="message" type="text" />
<div>{{ message }}</div>
</template>
<script setup lang="ts">
import { ref } from 'vue' // 实时监听
const message = ref("message")
</script>
<style>
.active {
color: red;
}
.other {
color: blue;
}
.h {
height: 300px;
border: 1px solid #ccc;
}
</style>