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原生JS添加删除Class

<!DOCTYPE html>
<html lang="en">

 

<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>JS原生添加删除Class</title>
<style>
#a{
width: 100px;
height: 100px;
color: aqua;
text-align: center;
line-height: 99px;
background-color: #000000;
}
</style>
</head>

 

<body>
<div id="a"></div>

 

<script>
function hasClass(obj, cls) {
return obj.className.match(new RegExp('(\\s|^)' + cls + '(\\s|$)'));
};

 

function addClass(obj, cls) {
if (!hasClass(obj, cls)) obj.className += " " + cls;
}

 

Object.prototype.removeClass = function removeClass(obj, cls) {
if (hasClass(obj, cls)) {
var reg = new RegExp('(\\s|^)' + cls + '(\\s|$)');
obj.className = obj.className.replace(reg, ' ');
}
};

 

function toggleClass(obj, cls) {
console.log(this.hasClass)

 

if (this.hasClass(obj, cls)) {
this.removeClass(obj, cls);
} else {
this.addClass(obj, cls);
}
};
var a = document.getElementById('a');
toggleClass(a,'a');
console.log(a.className);
a.innerHTML = a.className;
</script>
</body>

 

</html>
 
学习地址：  https://www.cnblogs.com/lewayjack/p/6778016.html
Dome地址：http://runjs.cn/code/foby1shi
posted @ 2018-02-24 14:00  白夜书生  阅读(302)  评论(0)  编辑  收藏  举报