方法1:使用className属性;
方法2:使用classList API;
//用于匹配类名存在与否
function reg(name){return new RegExp('(^|\\s)' name '(\\s |$)');
}//hasClass addClass removeClass toogleClass
var hasClass,addClass,removeClass;
if('classList' in document.documentElement){hasClass = function(obj, cname) { // obj为要操作的元素对象,cname是类名return obj.classList.contains(cname);};addClass = function(obj, cname) {obj.classList.add(cname);};removeClass = function(obj,cname) {obj.classList.remove(cname);};toggleClass = function(obj, cname) {obj.classList.toggle(cname);};
}else{hasClass = function(obj, cname) {return reg(cname).test(obj.className);};addClass = function(obj, cname) {if(!hasClass(obj,cname)){obj.className=obj.className ' ' cname; }};removeClass = function(obj, cname) {obj.className=obj.className.replace(reg(cname),' ');};toggleClass = function(obj, cname) {var toggle=hasClass(obj,cname)?removeClass:addClass;toggle(obj,cname);};
}//true
document.body.classList.toString() === document.body.className;
注意:这种方法每次只能传一个类名且不能级联操作,而jquery下面的类似操作是可以操作多个类名的。
所以扩展一下:
//addClass
DOMTokenList.prototype.addClass = function(str) {tts.split(' ').forEach(function(c){this.add(c);}.bind(this));return this;
}//removeClass
DOMTokenList.prototype.removeClass = function(str) {tts.split(' ').forEach(function(t){this.remove(t);}.bind(this));return this;
}//removeClass
DOMTokenList.prototype.toggleClass = function(str) {tts.split(' ').forEach(function(t){this.toggle(t);}.bind(this));return this;
}
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