vue组件

作者: 婲魢銣佌亾荷姒堪 | 来源:发表于2018-09-20 14:34 被阅读0次

    组件

    组件(component):是vue最强大的功能之一 组件化开发
                                        组件可以拓展 HTML 元素,封装可重用代码
    \color{orange}{注意:}
                  \color{orange}{在组件模板中不能有两个以上的兄弟元素}
                  \color{orange}{在全局组件中,必须把组件放在new Vue上面,否则会报错}

    组件分为两种:全局组件、局部组件

    全局组件代码:

    例子:

    <div id="app">
        <aa></aa>
    </div>
    <script>
        Vue.component('aa',{
            template:`
        <ul>
            <li>1</li>
            <li>1</li>
            <li>1</li>
            <li>1</li>
        </ul>
        `
        })
        new Vue({
            el:'#app'
        })
    </script>
    
    局部组件代码:

    例子:

    <div id="app">
        <aa></aa>
    </div>
    <script>
        new Vue({
            el:'#app',
            components:{
                'aa':{
            template:`
                <ul>
                    <li>1</li>
                    <li>1</li>
                    <li>1</li>
                    <li>1</li>
                </ul>
            `
                }
            }
        })
    </script>
    

    例子:

    \color{#f84f84}{点击按钮弹出窗口}

    <div id="app">
        <aa></aa>
    </div>
    <script>
        Vue.component("aa",{
            template:`
                <div>
                    <h1>{{msg}}</h1>
                    <button @click='alt'>按钮</button>
                </div>
            `,
            data:function(){
                return{
                    msg:'dcgf'
               }
           },
           methods:{
               alt:function(){
                   alert(11111) 
               }
           }
       })
        new Vue({
            el:'#app'
        })
    

    组件之间的传值\color{#f84f84}{(重点)}

                父传子:用属性名     props:['属性']
                子传父:用事件名      $emit
                同级之间传值:第三方量

    全局组件\color{#98a456}{父传子}代码:

    例子1:

    <div id="app">
        <my-component></my-component>
    </div>
    <script>
        Vue.component("my-component",{
            template:`
                <div>
                    <h2>我是my-component组件的标题</h2>
                    <my-child v-bind:zxc='zxx'></my-child>
                </div>
            `,
            data:function(){
                return{
                    zxx:'fsadgdrvgrf'
                }
            }
        })
        Vue.component("my-child",{
            props:['zxc'],
            template:`
                <div>
                    <h3>我是my-child组件中的标题</h3>
                    <p>{{zxc}}</p>
                </div>
            `
        })
        new Vue({
            el:'#app'
        })
    </script>
    

    例子1:\color{#65df42}{水果列表}

    <div id="app">
        <my-father></my-father>
    </div>
    <script>
        Vue.component("my-father",{
            template:`
            <div>
                <my-son v-bind:tit='title'></my-son>
                <my-list v-bind:fruit='arr'></my-list>
            </div>
        `,
            data:function(){
                return{
                    arr:['苹果','梨子','橘子'],
                    title:'水果列表'
                }
            }
        })
        Vue.component("my-son",{
            props:['tit'],
            template:`
                <h2>{{tit}}</h2>
        `
        })
        Vue.component("my-list",{
            props:['fruit'],
            template:`
                <ul>
                    <li v-for='value in fruit'>{{value}}</li>
                </ul>
        `
        })
        new Vue({
            el:'#app'
        })
    </script>
    

    例子2:\color{#65df42}{水果列表点击按钮添加删除}

    <div id="app">
        <my-father></my-father>
    </div>
    <script>
        Vue.component('my-father',{
            template:`
                <div>
                    <input type='text' v-model='fruit'> <button @click='add'>添加</button>
                    <my-child v-bind:fruList='list'></my-child> 
                </div>
            `,
            data:function(){
                return{
                list:['苹果','梨子','香蕉'],
                fruit:''
                }
            },
            methods:{
                add:function(){
                this.list.push(this.fruit)
                }
            }
        })
        Vue.component('my-child',{
            props:['fruList'],
            template:`
            <ul>
                <li v-for="(value,index) in fruList">
                    {{value}}
                    <button @click='delt(index)'>删除</button>
                </li>
            </ul>
            `,
            methods:{
                delt:function(ind){
                this.fruList.splice(ind,1)
                }
            }
        })
        new Vue({
         el:'#app'
        }) 
    </script>
    

    例子3:\color{#65df42}{购物车}

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Document</title>
        <link rel="stylesheet" href="css/bootstrap.css">
    </head>
    <body>
        <div id='app'>
          <my-father></my-father>
        </div>
    <script src="js/vue.js"></script>
    <script>
       Vue.component('my-father',{
           template:`
             <div class='container'>
              <table class='table table-bordered text-center'>
                 <thead>
                     <tr>
                       <th class='text-center'>编号</th>
                       <th class='text-center'>名称</th>
                       <th class='text-center'>单价</th>
                       <th class='text-center'>数量</th>
                       <th class='text-center'>小计</th>
                     </tr>
                 </thead>
                 <my-child v-bind:list='fruList'></my-child>
              </table>
            </div>
           `,
           data:function(){
               return{
                   fruList:[
                       {pname:'apple',price:3,count:3,sub:9},
                       {pname:'pear',price:4,count:4,sub:16},
                       {pname:'orange',price:5,count:5,sub:25}
                   ]
               }
           }
       }) 
       
      Vue.component('my-child',{
          props:['list'],
          template:`
             <tbody>
                 <tr v-for="(value,index) in list">
                    <td>{{index+1}}</td>
                    <td>{{value.pname}}</td>
                    <td>{{value.price}}</td>
                    <td>
                        <button @click='add(index)'>+</button>
                        <span>{{value.count}}</span>
                        <button @click='redu(index)'>-</button>
                     </td>
                    <td>{{value.sub}}</td>
                 </tr>
                 <tr>
                    <td colspan=5>总价:{{sum}}</td>
                 </tr>
             </tbody>
            
          `,
          data:function(){
              return{
                  sum:50
              }
          },
          methods:{
              add:function(ind){
                 this.list[ind].count++ ;
                  //计算小计
                  this.list[ind].sub=this.list[ind].count*this.list[ind].price;
                  this.countSum();
              },
              redu:function(ind){
                  if(this.list[ind].count>1){
                     this.list[ind].count--
                  }  
                   //计算小计               
                  this.list[ind].sub=this.list[ind].count*this.list[ind].price;
                  this.countSum();
              },
              countSum:function(){
                  for(var i=0,total=0;i<this.list.length;i++){
                      total+=this.list[i].sub;
                  } 
                  this.sum=total;
              }
          }
      })  
       new Vue({
           el:'#app'
       })
    </script>
    </body>
    </html>
    

    全局组件\color{#98a456}{子传父}代码:

    例子1:

    <div id='app'>
       <my-father></my-father>
    </div>
    <script src='js/vue.js'></script>
    <script>
        Vue.component('my-father',{
            template:`
                <div>
                   <h1>{{mess}}</h1>
                   <my-child @send='revMsg'></my-child>
                </div>
             `,
            data:function(){
                return{
                    mess:''
                }
            },
            methods:{
               revMsg:function(txt){
                   this.mess=txt
               }
             }
        })
        
        Vue.component('my-child',{
            template:`
                 <button @click='sendFather'>给父组件</button>
             `,
            data:function(){
                return{
                    msg:'张世远是共产主义接班人'
                }
            },
            methods:{
                sendFather:function(){
    //                   this.$emit('自定义事件',参数) 
                    this.$emit('send',this.msg)
                }
            }
        }) 
        new Vue({
            el:"#app"
        })
    </script>
    

    例子2:

    <div id='app'>
       <father></father>
    </div>
    <script src='js/vue.js'></script>
    <script>
        Vue.component('father',{
            template:`
              <div>
                <h1>{{mess}}</h1>  
                <son @send='rcvMsg'></son>
              </div>
             `,
            data:function(){
                return{
                   mess:'' 
                }
                
            },
            methods:{
                rcvMsg:function(txt){
                    this.mess=txt;
                }
            }
        })
        
         Vue.component('son',{
            template:`
                <button @click='sendToFather'>我是子组件,我要向父组件传值</button>
              `,
             data:function(){
                 return{
                     msg:'子组件向父组件传值'
                 }
             },
             methods:{
                 sendToFather:function(){
                     this.$emit('send',this.msg )
                 }
             }
        })
       new Vue({
           el:"#app",
           
       })
    </script>
    

    例子:\color{#65df42}{谈话}

    <div id="app">
        <chat></chat>         
    </div>
    <script>
        Vue.component('chat',{
            template:`
                <div>
                    <ul>
                        <li v-for='value in arr'>{{value}}</li>
                    </ul>
                    <user @send='rcvMsg' userName='jack'></user>
                    <user @send='rcvMsg' userName='rose'></user>
                </div>
            `,
            data:function(){
                return{
                    arr:[]
                }
            },
            methods:{
                rcvMsg:function(txt){
                    this.arr.push(txt)
                }
            }
        })
        Vue.component('user',{
            props:['userName'],
            template:`
                <div>
                    <ul>
                        <label>{{userName}}</label>
                        <input type="text" v-model='inputVal'>
                        <button @click='sendMsg'>发送</button>
                    </ul>
                </div>
        `,
            data:function(){
                return{
                    inputVal:''
                }
            },
            methods:{
                sendMsg:function(){
                    this.$emit('send',this.userName+':'+this.inputVal)
                }
            }
        })
        new Vue({
            el:'#app'
        })
    </script>
    

    全局组件\color{#98a456}{非父子组件传值}代码:

    例子:

    <div id="app">
        <child></child>
        <son></son>
    </div>
    <script>
        var bus=new Vue();
        Vue.component('child',{
            template:`
                <div>
                    <h1>我是child组件</h1>
                    <button @click='sendMsg'>发送数据给son</button>
                </div>
        `,
            data:function(){
                return{
                msg:'hello vue'
                }
            },
            methods:{
                sendMsg:function(){
                    bus.$emit('send',this.msg)
                }
            }
        })
        Vue.component('son',{
            template:`
                <div>
                    <h1>我是son组件</h1>
                    <a href=''>{{mess}}</a>
                </div>
        `,
            data:function(){
                return{
                    mess:''
                }
            },
            mounted:function(){
                bus.$on('send',msg=>{
                    console.log(this);
                    this.mess=msg
                })
            }
        })
        new Vue({
            el:'#app'
        })
    </script>

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