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How to use the div attribute in control elements

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Jul 25, 2018 am 09:46 AM

The content shared with you in this article is about how to use the div attribute in the control element. The content is very detailed. Next, let’s take a look at the specific content. I hope it can help you.

1. Requirements analysis

Change the width, height, color, display, reset and other attributes of the element.

2. Technical analysis

Basics css, html, js

##3. Detailed analysis

As shown in the picture, click the button to change the element attributes:

##3.1 HTML part

According to the view, it is not difficult to find that the content is divided into two parts: button bar and renderings, so set two p.

<body>
	<p class="outer">
		<input type="button" value="变宽" >
		<input type="button" value="变高" >
		<input type="button" value="变色" >
		<input type="button" value="隐形" >
		<input type="button" value="重置" >
	</p>
	<p class="content">	
	</p>	
</body>

3.2 CSS part

<style type="text/css"> 
/*页面格式化，清除浏览器默认编剧(浏览器预留给滚动条边距)*/ 
      *{
         padding: 0;
         margin: 0;
        }
/*设置元素宽度，元素居中，文本居中*/
      .outer{
	 width: 500px;
	 argin: 0 auto;
	 text-align: center;
	}
/*元素样式*/
      .content{
	 width: 100px;
	 height: 100px;
	 background: black;
	 margin: 10px auto;
	}
</style>

3.3 JS part

<script type="text/javascript">
		var changeStyle=function(elem,attr,value){//声明一个函数，包含三个参数(元素，属性，值)，外部函数1			elem.style[attr]=value//三个参数之间的函数关系，元素的样式属性的集合等于值(点操作符:对象，方括号操作符:对象，数组)
		};
		window.onload=function(){//文档加载完成时，调用函数
			/*声明四大变量：按钮，元素，属性，值*/
			var btn=document.getElementsByTagName("input");//按钮变量来自标签
			var ctt=document.getElementClssName("content");//元素变量来自类名
			var att=["width","height","background","display","display"];//属性名数组集合
			var val=["200px","200px","red","none","block"];//属性值数组集合，属性值与属性名一一对应
		for(var i=0;i<btn.length;i++){			btn[i].index=i;//数组btn中元素的索引值=i,给按钮数组中的每个元素编号
			btn[i].onclick=function(){//给数组中的元素添加点击事件，点击第i个按钮，调用函数				
			       changeStyle(ctt,att[this.index],val[this.index])//结合外部函数1，形成闭包，ctt为元素，this.index为按钮数组中元素的索引值，即i;属性att数组的第（this.index=i）个元素，属性值数组val的第（this.index=i）个元素值。
			       this.index==btn.length-1&&(ctt.style.cssText=" ");//可写成:if(this.index==btn.length-1){ctt.style.cssText=""},点击第四个按钮，清空css样式(cssText()适用块元素)
		    }
	    }
	}
</script>

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