1.动态组件
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
<!DOCTYPE html><html><head> <meta charset="utf-8"> <style> #app { font-size: 0 } .dynamic-component-demo-tab-button { padding: 6px 10px; border-top-left-radius: 3px; border-top-right-radius: 3px; border: 1px solid #ccc; cursor: pointer; margin-bottom: -1px; margin-right: -1px; background: #f0f0f0; } .dynamic-component-demo-tab-button.dynamic-component-demo-active { background: #e0e0e0; } .dynamic-component-demo-tab-button:hover { background: #e0e0e0; } .dynamic-component-demo-posts-tab { display: flex; } .dynamic-component-demo-tab { font-size: 1rem; border: 1px solid #ccc; padding: 10px; } .dynamic-component-demo-posts-sidebar { max-width: 40vw; margin: 0 !important; padding: 0 10px 0 0 !important; list-style-type: none; border-right: 1px solid #ccc; line-height: 1.6em; } .dynamic-component-demo-posts-sidebar li { white-space: nowrap; text-overflow: ellipsis; overflow: hidden; cursor: pointer; } .dynamic-component-demo-active { background: lightblue; } .dynamic-component-demo-post-container { padding-left: 10px; } .dynamic-component-demo-post > :first-child { margin-top: 0 !important; padding-top: 0 !important; } </style> <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script></head><body><div id="app"> <button v-for="tab in tabs" class="dynamic-component-demo-tab-button" v-bind:class="{'dynamic-component-demo-active': tab === currentTab}" @click="currentTab = tab">{{ tab }}</button> <keep-alive> <component v-bind:is="currentTabComponent"></component> </keep-alive></div><script> Vue.component('tab-posts', { data: function(){ return { posts: [ {id: 1, title: 'Cat Ipsum', content: 'Cont wait for the storm to pass, ...'}, {id: 2, title: 'Hipster Ipsum', content: 'Bushwick blue bottle scenester ...'}, {id: 3, title: 'Cupcake Ipsum', content: 'Icing dessert souffle ...'}, ], selectedPost: null } }, template: `<div class="dynamic-component-demo-posts-tab dynamic-component-demo-tab"> <ul class="dynamic-component-demo-posts-sidebar"> <li v-for="post in posts" v-bind:key="post.id" v-on:click="selectedPost = post" v-bind:class="{'dynamic-component-demo-active': post===selectedPost}"> {{ post.title }} </li> </ul> <div class="dynamic-component-demo-post-container"> <div v-if="selectedPost" class="dynamic-component-demo-post"> <h3>{{ selectedPost.title }}</h3> <div v-html="selectedPost.content"></div> </div> <strong v-else> Click on a blog title to the left to view it. </strong> </div> </div>` }); Vue.component('tab-archive', { template: '<div class="dynamic-component-demo-tab">Archive component</div>' }); new Vue({ el: '#app', data: { currentTab: 'Posts', tabs: ['Posts', 'Archive'] }, computed: { currentTabComponent: function(){ return 'tab-' + this.currentTab.toLowerCase() } } });</script></body></html> |
在动态组件上使用keep-alive，可以在组件切换时保持组件的状态，避免了重复渲染的性能问题。
2.异步组件
Vue 允许你以一个工厂函数的方式定义你的组件，这个工厂函数会异步解析你的组件定义。
|
1
|
Vue.component('async-example', function (resolve, reject) {}) |
这里可以回顾一下 Vue.js — 组件基础。
我们使用通过webpack打包的Vue项目来介绍异步组件。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
<!-- HelloWorld.vue --><template> <div> <h2 class="title">{{msg}}</h2> </div></template><script>export default { data () { return { msg: 'Hello Vue!' } }}</script><!-- Add "scoped" attribute to limit CSS to this component only --><style scoped> .title { padding: 5px; color: white; background: gray; }</style><!-- App.vue --><template> <div id="app"> <HelloWorld/> </div></template><script>import HelloWorld from './components/HelloWorld'export default { name: 'App', components: { HelloWorld }}</script><style></style> |
我们把App.vue的<script>标签里面的内容改为：
|
1
2
3
4
5
6
|
export default { name: 'App', components: { HelloWorld: () => import('./components/HelloWorld') }} |
这样就实现了App组件异步加载HelloWorld组件的功能。
我们可以实现按需加载。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
|
<!-- App.vue --><template> <div id="app"> <button @click="show = true">Load Tooltip</button> <div v-if="show"> <HelloWorld/> </div> </div></template><script>export default { data: () => ({ show: false }), components: { HelloWorld: () => import('./components/HelloWorld') }}</script><style></style> |
这里的异步组件工厂函数也可以返回一个如下格式的对象：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
|
const AsyncComponent = () => ({ // 需要加载的组件 (应该是一个 `Promise` 对象) component: import('./MyComponent.vue'), // 异步组件加载时使用的组件 loading: LoadingComponent, // 加载失败时使用的组件 error: ErrorComponent, // 展示加载时组件的延时时间。默认值是 200 (毫秒) delay: 200, // 如果提供了超时时间且组件加载也超时了， // 则使用加载失败时使用的组件。默认值是：`Infinity` timeout: 3000}) |
参考：
以上就是深入了解Vue动态组件和异步组件的详细内容，更多关于Vue动态组件和异步组件的资料请关注服务器之家其它相关文章！
原文链接：https://www.cnblogs.com/gzhjj/p/11792692.html
