50 lines
1.4 KiB
HTML
50 lines
1.4 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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<!-- 1. 导入vue.js的脚本文件 -->
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<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
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</head>
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<body>
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<div id="app">
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<h1> {{ add() }}</h1>
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<h1> {{ add() }}</h1>
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<h1> {{ sum }}</h1>
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<h1> {{ sum }}</h1>
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</div>
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</body>
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<script>
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// 将 Vue 对象中的createApp reactive 属性赋值给createApp reactive
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const { createApp, reactive, ref, computed } = Vue; // 解构赋值语法
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// 创建一个 Vue 的应用程序
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createApp({
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// 组合式API 的 setup 用于设置响应式数据和方法
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setup() {
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const data = reactive({
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x: 10,
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y: 20
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})
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// 无缓存的方法
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const add = () => {
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console.log("add");
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return data.x + data.y
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}
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// 有缓存的方法——计算属性
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// 计算属性: 根据依赖响应式数据变化决定是否重新计算
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const sum = computed(() => {
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console.log("sum");
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return data.x + data.y;
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})
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// 返回数据
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return {
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data, add, sum
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}
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}
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}).mount('#app') // 将 Vue 应用程序挂载到app元素上
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</script>
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</html>
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