function tab(titleClass,contentClass,activeClass){
var tabTitle = document.getElementsByClassName(titleClass)[0].getElementsByTagName('div');
var tabContent = document.getElementsByClassName(contentClass)[0].getElementsByTagName('div');
for(var i = 0; i<tabTitle.length; i++){
tabTitle[i].onclick = (function(j){
return function(){
tabSelect(j)
}
})(i)
}
function tabSelect(index){
for(var i=0; i<tabTitle.length; i++){
tabTitle[i].classList = '';
tabContent[i].classList = '';
tabTitle[index].classList = activeClass;
tabContent[index].classList = activeClass;
}
}
}
tab('tabNav','tabContent','act')