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How to change the background color in vuejs

藏色散人

Sep 20, 2021 pm 03:14 PM

vuejs

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 id="自定义指令">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"

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