Detailed introduction to Vue structure (with examples)

This article brings you a detailed introduction to the Vue structure (with examples). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

1.Vue usage scenarios:

* 在html中通过script引入
* 在webpack中，由于配置有处理各种文件的loader，所以可以用import引入

2.Vue instructions

v-cloak
v-bind  ==> :
v-on ==> @
v-text
v-html
v-modal
:class : 简单值，数组，对象，数组中对象
:style ： 数组， 对象
v-for
v-if
v-show

• Customized global directive

Vue.derictive(自定义指令名字, 指令生效周期配置对象{
    bind : (被绑定的那个元素的js原生对象el) => {},   ==> 一旦绑上马上调用
    inserted : (el同上) => {},  ==> 元素插入到DOM之后再调用
    updated : (el同上, binding) => {}
}

• Customized local directive

var vm2 = new Vue({
  el: '#app2',
  data: {},
  methods: {},
  directives: { 
    'fontweight': {
      bind: function (el, binding) {
        el.style.fontWeight = binding.value
      }
    },
  }
})

3.Vue event modifier

.stop
.prevent
.capture
.self
.once
.self和.stop在阻止冒泡行为上的区别

4.Vue filter
The parameter passing rules of global filter are the same;
If global filter and local filter The name of the filter is the same. When using a filter inside a component, its own internal filter will be used first

• Global filter

Vue.filter('自定义过滤器名字' , function(第一参数来自于管道符 | 前的数据 ， 后面的参数是该过滤器被调用时候传递过来的参数){}

• Local filter

is defined in the filter attribute in the Vue instance

var vm2 = new Vue({
  el: '#app2',
  data: {},
  methods: {},
  filters: { 
    dateFormat: function (dateStr, pattern = '') {}
    }
  },
})

5.Vue key modifier
Key modifiers, like event modifiers like .self, are used after v-on events.

.enter
.tab
.up
.down
.left
.right
.delete
.esc
.space

• Custom global key modifier

Vue.config.keyCodes.自定义按键修饰符名字 = 按键的码值

6.Vue component life cycle

beforeCreated(){} ==> data和methods中数据还没初始化好
created(){} ==> data和methods中的数据已经初始化好
beforeMount(){} ==> 模板已经在内存中编译好了，但是没有被渲染到页面上
mounted(){} ==> 内存中的模板已经渲染到了页面行，用户可以看到页面了
beforeUpdate (){} ==> data中的数据已经更新，但是界面上的数据没有更新
updated (){} ==> 界面上数据更新结束
beforeDestory (){} ==> 此时data和methods中数据还可以使用
destoryed (){} ==> data和methods中数据都不能使用了，Vnode被完全销毁

7.Vue-resource
Similar to axios, but depends on Vue.js. After introduction, the $http attribute is automatically added to the Vue instance

$http.get()
$http.post()
$http.jsonp()

均返回一个promise
this.$http.get('http://vue.studyit.io/api/getlunbo').then(function (result) {
  console.log(result.body)
})

8. Vue animation

• Class name

v-enter
v-enter-active
v-enter-to
v-leave
v-leave-active
v-leave-to

• Use third-party class name

<transition
name=&#39;my&#39;
enter-active-class="bounceIn"
leave-active-class="bounceOut"
:duration="{ enter: 200, leave: 400 }">
  <h3 v-if="flag" class="animated">这是一个H3</h3>
</transition>

• Animation hook function

<transition
  @before-enter="beforeEnter"
  @enter="enter"
  @after-enter="afterEnter">
  <p class="ball" v-show="flag"></p>
</transition>

beforeEnter (要执行动画的那个对象的原生DOM对象el) {} ==> 动画入场之前，设置动画的起始样式
enter (el , done) {done()} ==> 动画开始后样式，设置动画结束样式
afterEnter () {} ==> 动画完全结束回调

9.Vue creates components

• (1) Component template object creation

方式1：
Vue.extend({
    template : ''
})

方式2：
直接一个 Object

• (2) Register global component

Vue.component(自定义组件名字, 组件模板)

• (3) The difference between component data and Vue instance data

Component data must return object

10. Component switching and animation

• Component switching

<component :is="comName"></component>
comName是变量

• Animation when component switching

<!-- 通过 mode 属性,设置组件切换时候的 模式 -->
<transition mode="out-in">
  <component :is="comName"></component>
</transition>

11. Passing values ​​between parent and child components

• Passing values ​​from parent components to child components

传单纯值：
<com1 v-bind:parentmsg="msg"></com1>

传函数
<com2 @func="show"></com2>
this.$emit('func', this.sonmsg)

• The child component passes the value to the parent component

Pass the parameters of the function through the parent component

• $refs

12.Vue routing

• Same as Vue-resource, you need to introduce a vue-router.js file

let routeObj = new VueRouter({  
    routes : [
        {path : '' , redrect : '' , component : null}
    ]
})

var vm = new Vue({
  el: '#app',
  router: routerObj
});

• Routing parameters

<router-link to="/login?id=10&name=zs">login</router-link>
routes: [
  { path: '/login/:id/:name', component: login , children : [{path , redrect , component , children}] },
]
$route.params.id

• One route corresponds to multiple components

<router-view></router-view>
<p class="container">
  <router-view name="left"></router-view>
  <router-view name="main"></router-view>
</p>

var router = new VueRouter({
  routes: [
    {
      path: '/', components: {
        'default': header,
        'left': leftBox,
        'main': mainBox
      }
    }
  ]
})

13.watch monitors data changes or routing changes in data

var vm = new Vue({
  el: '#app',
  data: {firstname: '',},
  watch: { // 使用这个 属性，可以监视 data 中指定数据的变化，然后触发这个 watch 中对应的 function 处理函数
    'firstname': function (newVal, oldVal) {
      this.fullname = newVal + '-' + this.lastname
    },
    '$route.path': function (newVal, oldVal) {   ==> 只需要这是一个变量
      if (newVal === '/login') {
        console.log('欢迎进入登录页面')
      } else if (newVal === '/register') {
        console.log('欢迎进入注册页面')
      }
    }
  }
});

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