1. 样式绑定
  1.1 class绑定
    使用方式:v-bind:class="expression"
    expression的类型:字符串、数组、对象

  1.2 style绑定
    v-bind:style="expression"
    expression的类型:字符串、数组、对象

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
        <title>vue的样式绑定</title>
        <style>
            .a{
                color: red;
            }
            .b{
                color: yellow;
            }
            .c{
                font-size: 36px;
            }
        </style>
    </head>
    <body>
        <div id="app">
            <ul>
                <li>
                    <h3>样式一</h3>
                    <div :class="xa">{{msg}}</div>
                </li>
                <li>
                    <h3>样式二</h3>
                    <div :class="xb">{{msg}}</div>
                </li>
                <li>
                    <h3>样式三</h3>
                    <div :class="xc">{{msg}}</div>
                </li>
                <li>
                    <h3>样式四</h3>
                    <div :style="{fontSize:xd}">{{msg}}</div>
                </li>
            </ul>
        </div>
    </body>
    <script type="text/javascript">
        new Vue({
            el:"#app",
            data() {
                return {
                    msg: 'hello vue',
                    xa:'a',
                    xb:'b',
                    xc:['a','c'],
                    xd:'88px'
                }
            },
        })
    </script>
</html>

效果:

2. 事件处理器
  事件监听可以使用v-on 指令

      <!-- 阻止单击事件冒泡 -->
      <a v-on:click.stop="doThis"></a>
      <!-- 提交事件不再重载页面 -->
      <form v-on:submit.prevent="onSubmit"></form>
      <!-- 修饰符可以串联  -->
      <a v-on:click.stop.prevent="doThat"></a>
      <!-- 只有修饰符 -->
      <form v-on:submit.prevent></form>
      <!-- 添加事件侦听器时使用事件捕获模式 -->
      <div v-on:click.capture="doThis">...</div>
      <!-- 只当事件在该元素本身(而不是子元素)触发时触发回调 -->
      <div v-on:click.self="doThat">...</div>
      <!-- click 事件只能点击一次 -->
      <a v-on:click.once="doThis"></a> 
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
        <title>vue的事件处理器</title>
        <style>
            div{
                padding: 30px;
            }
        </style>
    </head>
    <body>
        <div id="app">
            <ul>
                <li>
                    <h3>文本</h3>
                    {{msg}}
                </li>
                <li>
                    <h3>防止事件冒泡</h3>
                    <div style="height: 300px; width: 300px; background-color: red;" @click="a">
                        <div style="height: 200px; width: 200px; background-color: blue;" @click="b">
                            <div style="height: 100px; width: 100px; background-color: yellow;" @click.stop="c">
                                <div style="height: 50px; width: 50px; background-color: pink;" @click.stop="d">
                                    
                                </div>
                            </div>
                        </div>
                    </div>
                </li>
                <li>
                    <h3>事件只能点击一次(模拟聊天信息发送)</h3>
                    {{qqmsg}}<input type="text" v-on:keyup.enter="send" v-model="msg" />
                    <button @click="send">ok</button>
                    <button @click.once="send">点一次</button>
                </li>
                <li>
                    <h3>表单中的复选框</h3>
                    <div v-for="item,index in hobby" >
                        <input type="checkbox" v-model="checkedIds" name="hobby" :value="item.id"/>{{item.name}}
                    </div>
                    {{checkedIds}}
                </li>
                <li>
                    <h3>表单中的下拉框</h3>
                    <select name="likes" v-model="selectId">
                        <option v-for="item,index in hobby" :value="item.id">{{item.name}}</option>
                    </select>
                    {{selectId}}
                </li>
            </ul>
        </div>
    </body>
    <script type="text/javascript">
        new Vue({
            el:"#app",
            data() {
                return {
                    msg: 'hello vue',
                    qqmsg:null,
                    hobby:[{
                        id:'1',name:'吃饭'
                    },{
                        id:'2',name:'睡觉'
                    },{
                        id:'3',name:'打豆豆'
                    }],
                    checkedIds:[],
                    selectId:null
                }
            },
            methods:{
                a(){
                    alert('a')
                },
                b(){
                    alert('b')
                },
                c(){
                    alert('c')
                },
                d(){
                    alert('d')
                },
                send(){
                    this.qqmsg = this.msg
                    this.msg=null
                }
            }
        })
    </script>
</html>

防止事件冒泡 

事件只能点击一次(模拟聊天信息发送)

表单中的复选框 

表单中的下拉框

完整表单

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
        <title>表单</title>
    </head>
    <body>
        <div id="app">
            <h1>标题</h1>
            <ul>
                <li>
                    <p>vue表单</p>
                    <label>姓名:</label><input v-model="uname" /><br />
                    <label>密码:</label><input v-model="upwd" type="password" /><br />
                    <!-- 将用户的输入值转为 Number 类型 -->
                    <label>年龄:</label><input v-model.number="age" /><br />
                    <label>性别:</label>
                    <input type="radio" v-model="sex" name="sex" value="1" /><input type="radio" v-model="sex" name="sex" value="0" />女<br />
                    <label>爱好:</label>
                    <div v-for="h in hobby">
                        <input type="checkbox" v-model="hobbies" v-bind:value="h.id" />{{h.name}}
                    </div>
                    <label>类别:</label>
                    <select v-model="type">
                        <option value="-1">===请选择===</option>
                        <option v-for="t in types" v-bind:value="t.id">{{t.name}}</option>
                    </select><br />
                    <label>备注:</label>
                    <textarea v-bind:value="mark"></textarea><br />
                    确认<input type="checkbox" v-model="flag" />
                    <input type="submit" v-bind:disabled="show" v-on:click="doSubmit" />
                </li>
            </ul>
        </div>
    </body>
    <script type="text/javascript">
        new Vue({
            el: '#app',
            data() {
                return {
                    uname: null,
                    upwd: null,
                    age: 10,
                    sex: 1,
                    hobby: [{
                        id: 1,
                        name: '篮球'
                    }, {
                        id: 2,
                        name: '足球'
                    }, {
                        id: 3,
                        name: '象棋'
                    }],
                    hobbies: [],
                    types: [{
                        id: 1,
                        name: 'A'
                    }, {
                        id: 2,
                        name: 'B'
                    }, {
                        id: 3,
                        name: 'C'
                    }],
                    type: null,
                    mark: '学生备注',
                    flag: false
                }
            },
            computed: {
                show: function() {
                    return !this.flag;
                }
            },
            methods: {
                doSubmit: function() {
                    console.log('doSubmit')
                    var obj = {
                        uname: this.uname,
                        upwd: this.upwd,
                        age:this.age+10,
                        sex: this.sex,
                        hobbies:this.hobbies,
                        type: this.type,
                        mark: this.mark,
                    }
                    console.log(obj);
                }
            }

        })
    </script>
</html>

效果:

 vue组件
 组件简介
组件(Component)是Vue最强大的功能之一
组件可以扩展HTML元素,封装可重用的代码
组件系统让我们可以用独立可复用的小组件来构建大型应用,几乎任意类型的应用的界面都可以抽象为一个组件树

props
props是父组件用来传递数据的一个自定义属性。
父组件的数据需要通过props把数据传给子组件,子组件需要显式地用props选项声明 "prop"

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
        <title>vue组件</title>
    </head>
    <body>
        <div id="app">
            <ul>
                <li>
                    <h3>局部vue组件</h3>
                    <my-button></my-button>
                </li>
                <li>
                    <h3> 父组件传值到子组件</h3>
                    <my-button m="牛头"></my-button>
                </li>
                <li>
                    <h3>子组件传值到父组件</h3>
                    <my-button @three-click='doSSS'></my-button>
                </li>
                <li>
                    <h3>全局vue组件的注册</h3>
                    <my-button2></my-button2>
                </li>
            </ul>
        </div>
    </body>
    <script type="text/javascript">
        Vue.component('my-button2',{
                props:['m'],
                template:'<button @click="doXXX">自定义按钮,被{{m}}点击了{{n}}次</button>',
                data() {
                    return {
                        n: 0
                    }
                },
                methods:{
                    doXXX(){
                        this.n++;
                        this.$emit('three-click',this.n,'sss','上天')
                    }
                }
            })
            
        new Vue({
            el:'#app',
            data() {
                return {
                    msg: 'hello vue 组件'
                }
            },
            computed:{
                xs(){
                    return this.n
                }
            },
            methods:{
                doSSS(n,x,y){
                    alert(n)
                    alert(x)
                    alert(y)
                }
            },
            components:{
                'my-button':{
                    /* 父组件传值到子组件 */
                    props:['m'],
                    template:'<button @click="doXXX">自定义按钮,被{{m}}点击了{{n}}次</button>',
                    data() {
                        return {
                            n: 0
                        }
                    },
                    methods:{
                        doXXX(){
                            this.n++;
                            this.$emit('three-click',this.n,'sss','上天')
                        }
                    }
                }
            }
        })
    </script>
</html>

效果:

 

posted on 2019-08-03 11:03  骑猪南下L  阅读(142)  评论(0编辑  收藏  举报