Implementation code sharing for adding and removing JavaScript class names-JS Tutorial-php.cn

Implementation code sharing for adding and removing JavaScript class names

黄舟

Release： 2017-04-24 09:09:43

Original

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本文给大家分享javascript实现类名的添加与移除功能，需要的朋友参考下吧

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){
  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;

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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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