Vue实现背景更换颜色

&amp;amp;amp;lt;!-- 分页上下页改变背景图效果 --&amp;amp;amp;gt;&amp;amp;amp;lt;!DOCTYPE html&amp;amp;amp;gt;&amp;amp;amp;lt;html&amp;amp;amp;gt;&amp;amp;amp

ShanCW

11093人浏览 · 2018-11-25 20:06:39

ShanCW · 2018-11-25 20:06:39 发布

在这里插入图片描述

<!-- 分页上下页改变背景图效果 -->
<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<title></title>
	<link rel="stylesheet" href="">
	<script type="text/javascript" src="../node_modules/vue/dist/vue.js"></script>
	<style type="text/css" media="screen">
		.page{
			list-style: none;
		}
		.page>li{
			float: left;
			margin-left: 10px;
		}
		.page>li>a{
			text-decoration: none;
		}
		.active{
			color: red;
			text-decoration: display;
		}
		div{
			width: 500px;height: 500px;
		}
	</style>
</head>
<body >
	<div id="app" v-bind:style="{backgroundColor:bgCol}">
		<ul class="page">
			<li> 
				<a href="#" v-on:click="decrease" >上一页</a> 
			</li>
			<li v-for="n in totalPage">
				<a href="#" v-bind:class="n==activeNum?'active':''">{{n}}</a>
			</li>
			<li>
				<a href="#" @click="increase">下一页</a>  
			</li>
		</ul>
	</div>
	<script type="text/javascript">
		var exampleData={
			
			//msg:"Hello Vue",
			bgCol:"#DB8623FF",
			totalPage:10,
			
			activeNum:3,
		}
		var app = new Vue({
			el:'#app',
			data:exampleData,
			methods:{
				decrease:function(){
					this.activeNum==1?'':this.activeNum-=1;
					
					this.bgCol=this.getRandom();

				},
				increase:function(){
					this.activeNum==10?'':this.activeNum+=1;
					this.bgCol=this.getRandom();
				},
				getRandom:function(){
					var r=Math.floor(Math.random()*256);
					var g=Math.floor(Math.random()*256);
					var b=Math.floor(Math.random()*256);
					var a=Math.random().toFixed(1);
					return `rgba(${r},${g},${b},${a})`
				}
			}
		})
	</script>
</body>
</html>

在这里插入图片描述

<!DOCTYPE html>
<html>

<head lang="en">
    <meta charset="UTF-8">
    <title>自定义指令实现随机背景</title>
    <style type="text/css" media="screen">
      #app{
        width: 999px;
        height: 999px;
      }
    </style>
</head>
<body>
    <h3>自定义指令</h3>
    <div id="app" v-change-background-color="myBgColor">
    <h3 >
    <input type="text" v-model="myBgColor" placeholder="请输入16进制颜色">
    </h3>
    </div>
    <script src="../node_modules//vue/dist/vue.js"></script>
    <script>
    var exampleData = {
        myBgColor: "#5FCA34",
    };
    new Vue({
        el: "#app",
        data: exampleData,
        methods:{
        	    getRandom:function(){
					var r=Math.floor(Math.random()*256);
					var g=Math.floor(Math.random()*256);
					var b=Math.floor(Math.random()*256);
					var a=Math.random().toFixed(1);
					return `rgba(${r},${g},${b},${b})`
                }
        },
        directives: {
            changeBackgroundColor: {
                bind: function(el, bindings) {
                    //el:指定绑定dom元素 h3dom对象
                    //bindings:自定义指令对象
                    //v-change-background-color="myBgColor"
                    //bindings.value;=="#ff0000"
					var r=Math.floor(Math.random()*256);
					var g=Math.floor(Math.random()*256);
					var b=Math.floor(Math.random()*256);
					var a=Math.random().toFixed(1);

                    el.style.backgroundColor =`rgba(${r},${g},${b},${a})`;
                    console.log("绑定成功");
                },
                update: function(el, bindings) {
                    console.log('已更新数据');
                    var r=Math.floor(Math.random()*256);
					var g=Math.floor(Math.random()*256);
					var b=Math.floor(Math.random()*256);
					var a=Math.random().toFixed(1);
                   el.style.background = `rgba(${r},${g},${b},${a})`
                }, //更新数据

            }
        }
    });
    </script>
</body>

</html>

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