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【Vue】Vue 组件的定义及组件之间的通信
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Vue 组件的定义及组件之间的通信

1. 组件的注册

总结:

1.挂载点
2.创建VUE组件实例(根组件)
3.创建全局组件
4.声明子组件及孙组件
5.组件与挂载点绑定

HTML代码实例:

  1. <!DOCTYPE html>
  2. <html lang="zh-CN">
  3. <head>
  4. <meta charset="UTF-8" />
  5. <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  6. <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  7. <title>组件的注册</title>
  8. <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
  9. </head>
  10. <body>
  11. <!-- 挂载点 -->
  12. <div id="app">
  13. <!-- 组件挂载 -->
  14. <greeting />
  15. </div>
  16. <script>
  17. // 应用实例
  18. const app = Vue.createApp({
  19. // 根组件配置项
  20. });
  21. // 全局组件(父组件)
  22. // app.component(组件名称,{组件配置项})
  23. app.component('greeting', {
  24. // html模板
  25. template: `
  26. <h2>Hello, {{uname}}</h2>
  27. <button @click='setLike'>点赞 + {{count}}</button>
  28. <!-- 命名规则: 小驼 -> 肉串 -->
  29. <my-award v-if='count >= 10' />
  30. `,
  31. // 数据
  32. data() {
  33. return {
  34. uname: '王老师',
  35. count: 0,
  36. };
  37. },
  38. // 方法
  39. methods: {
  40. setLike() {
  41. this.count++;
  42. },
  43. },
  44. // 声明子组件(复数属性)
  45. components: {
  46. // 奖励组件
  47. myAward: {
  48. template: `<p>实在太受欢迎了</p>`,
  49. data() {
  50. return {};
  51. },
  52. components: {
  53. // 声明子的子组件
  54. // userName: 小驼
  55. // last-user-name : 肉串
  56. },
  57. },
  58. },
  59. });
  60. // 根组件实例 (vue应用与挂载点绑定)
  61. const vm = app.mount('#app');
  62. </script>
  63. </body>
  64. </html>

2. 向子组件值参:属性

总结:

props:用于接收父组件中传来的参数(用的是自定义属性)

HTML代码实例:

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4. <meta charset="UTF-8">
  5. <meta http-equiv="X-UA-Compatible" content="IE=edge">
  6. <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7. <title>向子组件值参:属性</title>
  8. <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
  9. </head>
  10. <body>
  11. <div id="app"></div>
  12. <!-- 父组件的模板 -->
  13. <template id="parent">
  14. <counter uname='admin' email='nx99@qq.com'>
  15. </template>
  16. <!-- 子组件模板:必须使用ID选择符 -->
  17. <template id="child">
  18. <p>UserName:{{uname}}</p>
  19. <p>UserEmail:{{email}}</p>
  20. </template>
  21. <script>
  22. const app = Vue.createApp({
  23. //父组件
  24. template: `#parent`,
  25. });
  26. app.component('counter', {
  27. //子组件
  28. // props:用于接收父组件中传来的参数(用的是自定义属性)
  29. props: ['uname', 'email'],
  30. template: `#child`,
  31. })
  32. const vm = app.mount('#app');
  33. </script>
  34. </body>
  35. </html>

3. 向父组件值参:自定义事件

总结:

  1. 父 -> 子:自定义属性
  2. 子 -> 父:自定义事件

HTML代码实例:

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4. <meta charset="UTF-8">
  5. <meta http-equiv="X-UA-Compatible" content="IE=edge">
  6. <meta name="viewport" content="width=device-width, initial-scale=1.0">
  7. <title>向父组件值参:自定义事件</title>
  8. <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
  9. </head>
  10. <body>
  11. <!--
  12. 1. 父 -> 子:自定义属性
  13. 2. 子 -> 父:自定义事件
  14. -->
  15. <div id="app">
  16. <counter @review='review'>
  17. </div>
  18. <template id="counter">
  19. <button @click="count++">点赞 + {{count}}</button>
  20. <button @click="review()">评论</button>
  21. </template>
  22. <script>
  23. const app = Vue.createApp({
  24. methods: {
  25. review(count) {
  26. console.log(count);
  27. if (count >= 10) {
  28. alert('可以下课了');
  29. };
  30. },
  31. },
  32. });
  33. app.component('counter', {
  34. template: `#counter`,
  35. data() {
  36. return {
  37. count: 5,
  38. }
  39. },
  40. methods: {
  41. review() {
  42. this.$emit('review', this.count);
  43. },
  44. },
  45. })
  46. const vm = app.mount('#app');
  47. </script>
  48. </body>
  49. </html>
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