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How to use the div attribute in control elements
- 不言Original
- 2018-07-25 09:46:341927browse
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>Related recommendations:
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