原生js添加class

原生js添加class

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

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

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){
if(hasClass(obj,cls)){
removeClass(obj, cls);
}else{
addClass(obj, cls);
}
}

function toggleClassTest(){
var obj = document. getElementById('test');
toggleClass(obj,"testClass");
}
-------------------------------

parent.className = " newDiv";

//改变classname