Home >Web Front-end >Vue.js >How to change the background color in vuejs

How to change the background color in vuejs

藏色散人
藏色散人Original
2021-09-20 15:14:194977browse

How to modify the background color of vuejs: 1. Introduce a common css style in index.html; 2. Modify the background color of a single component by adding the "beforeCreate () {...}" code.

How to change the background color in vuejs

The operating environment of this article: windows7 system, vue2.5.17 version, Dell G3 computer.

How to change the background color in vuejs?

Vue implements the background change color operation

as follows:

<!-- 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;
		}
		p{
			width: 500px;height: 500px;
		}
	</style>
</head>
<body >
	<p id="app" v-bind:style="{backgroundColor:bgCol}">
		<ul class="page">
			<li> 
				<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" v-on:click="decrease" >上一页</a> 
			</li>
			<li v-for="n in totalPage">
				<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" v-bind:class="n==activeNum?&#39;active&#39;:&#39;&#39;">{{n}}</a>
			</li>
			<li>
				<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" @click="increase">下一页</a> 
			</li>
		</ul>
	</p>
	<script type="text/javascript">
		var exampleData={
			
			//msg:"Hello Vue",
			bgCol:"#DB8623FF",
			totalPage:10,
			
			activeNum:3,
		}
		var app = new Vue({
			el:&#39;#app&#39;,
			data:exampleData,
			methods:{
				decrease:function(){
					this.activeNum==1?&#39;&#39;:this.activeNum-=1;
					
					this.bgCol=this.getRandom();

				},
				increase:function(){
					this.activeNum==10?&#39;&#39;: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>

<!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>
 <p id="app" v-change-background-color="myBgColor">
 <h3 >
 <input type="text" v-model="myBgColor" placeholder="请输入16进制颜色">
 </h3>
 </p>
 <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(&#39;已更新数据&#39;);
     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>

Additional knowledge: vue sets the background color uniformly and changes the background color of a page individually

Sometimes we encounter individual changes The background fill color of a certain component, and we have introduced a common css style in index.html (the background color is set in the body). Since a single component does not have a body tag, to modify the background color of a single component, just add the following Just code.

beforeCreate () {
 document.querySelector(&#39;body&#39;).setAttribute(&#39;style&#39;, &#39;margin: 0 auto; width: 100%; max-width: 750px;min-width: 300px; background:#171b2a; overflow-x: hidden;height: 100%;&#39;);
}

Recommended learning: "vue tutorial"

The above is the detailed content of How to change the background color in vuejs. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn