原生JavaScript实现DOM元素class操作详解

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<style type="text/css"> 
 div.testClass{ 
 background-color:gray; 
 } 
</style> 

 <script type="text/javascript"> 
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"); 
} 
</script> 

<body> 
 <div id = "test" style = "width:250px;height:100px;"> 
 sssssssssssss 
 </div> 
 <input type = "button" value = "toggleClassTest" onclick = "toggleClassTest();" /> 
</body> 

以上内容为本文总结，希望这些方法能对您的学习或工作有所帮助，感谢支持。