JS实现addClass,removeClass,hasClass

js实现addClass,removeClass,hasClass

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function hasClass(ele,cls) {
??return ele.className.match(new RegExp('(\\s|^)'+cls+'(\\s|$)'));
}
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function addClass(ele,cls) {
??if (!this.hasClass(ele,cls)) ele.className += " "+cls;
}
?
function removeClass(ele,cls) {
??if (hasClass(ele,cls)) {
?? ? ? ? ?var reg = new RegExp('(\\s|^)'+cls+'(\\s|$)');
?? ?ele.className=ele.className.replace(reg,' ');
??}
}
?
//call the functions
addClass(document.getElementById("test"), "test");
removeClass(document.getElementById("test"), "test")
if(hasClass(document.getElementById("test"), "test")){//do something};