How to use the div attribute in control elements
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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:
What are HTML structural elements? Summary of various structural elements in HTML (plain text)Introduction to how to dynamically generate html elements and add attributes to elements (with code)The above is the detailed content of How to use the div attribute in control elements. For more information, please follow other related articles on the PHP Chinese website!
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