vue 常用术语,样式与事件绑定,列表渲染的实例演示

vue 常用术语,样式与事件绑定,列表渲染的实例演示

一.vue 常用术语

<!-- 挂载点,当前vue实例的作用域 -->
<div class="userName">
  <p>用户名:{{username}}</p>
</div>
<script>
  //  vue实例
  const app = Vue.createApp({
    data() {
      return {
        username: "张三",
      };
    },
  }).mount(".userName");
  //数据注入
  console.log(app.username);
  //完整注入
  console.log(app.$data.username);
  //响应式:实时响应外部更新
  app.username = "李四";
</script>

二.vue 样式与事件绑定

<!-- 样式 -->
<div class="userName">
  <p>用户名:<span v-text="username"></span></p>
  <p>邮箱:<span v-html="email"></span></p>
  <!-- <p v-bind:style="{color,border}">行内样式</p> -->
  <p :style="{color,border}">行内样式</p>
  <!-- <p v-bind:class="active">类样式</p> -->
  <p :class="active">类样式</p>
</div>
<!-- 事件绑定 -->
<div class="input">
  <!-- v:on事件属性,v-on可简化为@,event:$event -->
  <input type="text" v-on:input="content=$event.target.value" />
  <span>{{content}}</span>
  <!--:value回显 -->
  <input type="text" @input="content=$event.target.value" :value="content" />
  <span>{{content}}</span>
  <!-- v-model -->
  <input type="text" v-model="content" />
  <span>{{content}}</span>
  <!-- v-model.lazy延迟响应,失去焦点时响应 -->
  <input type="text" v-model.lazy="content" />
  <span>{{content}}</span>
</div>
<div class="net" onclick="console.log('hello')">
  <a href="http://php.cn" @click="showUrl($event)">网站链接:</a>
  <span>{{url1}}</span>
  <!-- .prevent替换默认行为,.stop防止冒泡 -->
  <a
    href="http://www.baidu.com"
    @click.prevent.stop="this.url2=$event.target.href"
    >网站链接:</a
  >
  <span>{{url2}}</span>
</div>
<script>
  const app = Vue.createApp({
    data() {
      return {
        username: "李四",
        email: "<a style='color:red'>123456@qq.com</a>",
        color: "blue",
        border: "1px solid black",
        active: "active",
      };
    },
  }).mount(".userName");
  const app2 = Vue.createApp({
    data() {
      return { content: "" };
    },
  }).mount(".input");
  const app3 = Vue.createApp({
    data() {
      return { url1: "", url2: "" };
    },
    methods: {
      showUrl(event) {
        event.preventDefault();
        event.stopPropagation();
        this.url1 = event.target.href;
      },
    },
  }).mount(".net");
</script>

三.vue 列表渲染

<div class="app">
  <!-- :key必须要添加,diff算法，key必须保证唯一性 -->
  <!-- 数组 -->
  <li v-for="(name,index) of names" :key="index">{{name}}</li>
  <!-- 对象 -->
  <li v-for="(item,key) of classes" :key="key">{{item}}</li>
</div>
<script>
  const app = Vue.createApp({
    data() {
      return {
        names: ["张三", "李四", "王五"],
        classes: {
          id: "一班",
          school: "第一小学",
        },
      };
    },
  }).mount(".app");
</script>