• vue模板语法(下)


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

    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;
    			}		
    			.c{
    			   font-size: 50px;
    			}
    		</style>
    	</head>
    	<body>
    		<div id="app">
    			<ul>
    				<li>
    					<h3>文本</h3>
    					{{msg}}
    				</li>
    				<li>
    					<h3>class绑定样式一</h3>
    					<div :class="xa">{{msg}}</div>
    				</li>
    					<li>
    					<h3>class绑定样式串联</h3>
    					<div :class="xc">{{msg}}</div>
    				</li>
    				<li>
    					<h3>style绑定样式</h3>
    					<div :style="{fontSize:xx}">{{msg}}</div>
    				</li>
    				
    			</ul>
    		</div>
    	</body>
    	<script type="text/javascript">
    		new Vue({
    			el: "#app",
    			data() {
    				return {
    					msg: 'Vue',
    					xa: 'a',			
    					xc: ['a', 'c'],
    					xx:'100px'
    				};
    			}
    		});
    	</script>
    </html>
    

      效果:

    2. 事件处理器

    Vue通过由点(.)表示的指令后缀来调用修饰符,
          .stop
          .prevent
          .capture
          .self
          .once 
     
          <!-- 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>
    

      按键修饰符:

       Vue允许为v-on在监听键盘事件时添加按键修饰符:
    
          <!-- 只有在 keyCode 是 13 时调用 vm.submit() -->
          <input v-on:keyup.13="submit">
    
          Vue为最常用的按键提供了别名
          <!-- 同上 -->
          <input v-on:keyup.enter="submit">
    
          全部的按键别名:
          .enter
          .tab
          .delete (捕获 "删除" 和 "退格" 键)
          .esc
          .space
          .up
          .down
          .left
          .right
          .ctrl
          .alt
          .shift
          .meta    
    

      防止事件冒泡 和 模拟QQ发送消息

    <!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>
    			div{
    			padding: 35px;
    		}
    	</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; 300px; background-color: orange;" @click="a">
    						<div style="height: 225px; 225px; background-color: skyblue;" @click="b">
    							<div style="height: 150px; 150px; background-color: yellow;" @click="c">
    								<div style="height: 80px; 80px; background-color: green;" @click.stop="d">
    
    								</div>
    							</div>
    						</div>
    					</div>
    				</li>
    				<li>
    					<h3>事件只能点击一次</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>
    
    		</ul>
    		</div>
    	</body>
    	<script type="text/javascript">
    		new Vue({
    			el: "#app",
    			data() {
    				return {
    					msg: 'Vue',
    					qqmsg: null,
    };
    			},
    			methods: {
    				a() {
    					alert('a')
    				},
    				b() {
    					alert('b')
    				},
    				c() {
    					alert('c')
    				},
    				d() {
    					alert('d')
    				},
    				send() {
    					this.qqmsg = this.msg,
    						this.msg = null
    				}
    			}
    		});
    	</script>
    </html>
    

     展示:

    vue表单中的复选框和下拉框

    <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="selectedId">
    						<option v-for="item,index in hobby" :value="item.id">{{item.name}}</option>
    					</select>
    					{{selectedId}}
    				</li>
    
    <script type="text/javascript">
    		new Vue({
    			el: "#app",
    			data() {
    				return {
                                         hobby:[{id:'001',name:'rap'},
    						{id:'002',name:'篮球'},
    						{id:'003',name:'007'}
    					],
    					checkedIds:[],
    					selectedId:[]
    				};
    		}
    		});
    	</script>
    

     展示:


     

    完整的表单

    <!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" />男
    					<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>
    

      展示:

    组件:

    <!DOCTYPE html>
    <html>
    	<head>
    		<meta charset="utf-8">
    		<script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
    		<title>Vue的组件</title>		
    	</head>
    	<body>
    		<div id="app">
    			<ul>
    				<li>
    					<h3>局部vue组件定义</h3>
    					<my-button></my-button>					
    				</li>
    				<li>
    					<h3>父组件传值子组件</h3>
    					<my-button m="铁蛋"></my-button>		
    				</li>
    				<li>
    					<h3>子组件传值父组件</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">
    		/*全局vue组件  */
    		Vue.component('my-button2',{
    					props:['m'],
    					template:'<button @click="doxxx">自定义按钮,被{{m}}点击了{{n}}下</button>',
    					data() {
    						return {
    							n: 0							
    						}
    					}
    				})
    		new Vue({
    			el: "#app",
    			data() {
    				return {
    					msg: 'Vue 组件'					
    				}
    			},
    			computed:{
    				xs(){
    					return this.n;
    				}
    			},
    			methods:{
    				dosss(n,z,m){
    					alert(n);
    					alert(z);
    					alert(m);
    				}
    			},
    			/* 局部vue组件定义 */
    			components:{
    				'my-button':{
    					/* 父组件传值子组件 */
    					props:['m'],					
    					template:'<button @click="doxxx">自定义按钮,被{{m}}点击了{{n}}下</button>',
    					data() {
    						return {
    							n: 0							
    						}
    					},
    					methods:{
    						doxxx(){
    							this.n++;
    							/* 子组件传值父组件 */
    							this.$emit('three-click',this.n,'麻子','钢弹');
    						}
    					}
    				},
    				
    			}
    		});
    	</script>
    </html>
    

      展示:

      

      

      

      

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  • 原文地址:https://www.cnblogs.com/chenjiahao9527/p/11294134.html
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