原生JS 选项卡代码实现

 1 <div class="main" id="tabs">
 2             <div class="tabDiv">
 3                 <a href="javascript:;" class="on">选项一</a>
 4                 <a href="javascript:;">选项二</a>
 5                 <a href="javascript:;">选项三</a>
 6             </div>
 7             <div class="con">
 8                 1111111111111111111111111
 9             </div>
10             <div class="con">
11                 2222222222222222222222222
12             </div>
13             <div class="con">
14                 3333333333333333333333333
15             </div>
16         </div>
17         
18         <div class="main" id="tabs1">
19             <div class="tabDiv">
20                 <a href="javascript:;" class="on">选项一</a>
21                 <a href="javascript:;">选项二</a>
22                 <a href="javascript:;">选项三</a>
23             </div>
24             <div class="con">
25                 1111111111111111111111111
26             </div>
27             <div class="con">
28                 2222222222222222222222222
29             </div>
30             <div class="con">
31                 3333333333333333333333333
32             </div>
33         </div>

fnTab("tabs");
            fnTab("tabs1");
            
            function fnTab(id){
                var parentEle = document.getElementById(id);
                var tabTools = getByClass(parentEle,"tabDiv")[0].getElementsByTagName("a");
                var conArr = getByClass(parentEle,"con");
                conArr[0].className += " active";
                for(var i=0;i<tabTools.length;i++){
                    (function(i){
                        tabTools[i].onclick = function(){
                            for(var j=0;j<conArr.length;j++){
                                removeClass(tabTools[j],"on");
                                removeClass(conArr[j],"active");
                            }
                        addClass(tabTools[i],"on");
                        addClass(conArr[i],"active");
                        }
                    })(i);
                    
                }
                
                
            }

            function getByClass(oParentEle,sClass){
                if(oParentEle.getElementsByClassName){
                    var oEles = oParentEle.getElementsByClassName(sClass);
                    return oEles;
                }else{
                    var oEles = oParentEle.getElementsByTagName("*");
                    var aRes = [];
                    for(var i=0;i<oEles.length;i++){
                        if(oEles[i].className == sClass){
                            aRes.push(oEles[i]);
                        }
                    }
                    return aRes;
                }
                
            }
            function addClass(ele,className){
                if(ele && ele.nodeType == 1){
                    var reg = new RegExp("\\b"+className +"\\b","g");
                    if(!reg.test(ele.className)){
                        ele.className += " "+className;
                    }
                }
                
            }
            function removeClass(ele,className){
                if(ele && ele.nodeType == 1){
                    var reg = new RegExp("\\b"+className +"\\b","g");
                if(reg.test(ele.className)){
                    ele.className = ele.className.replace(reg,"");
                }
                }
                
            }