<!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{
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