<li><a href="javascript:void(0)" onclick="changeGoodsModule(this)">品牌管理</a></li>

//切换功能模块
function changeGoodsModule(e) {
   
    var event = window.event || e;
  
    var target = event.target || event.srcElement;
  
    var activeEl = document.getElementsByClassName('active')[0];
    if (target == activeEl) {
        console.log('You click the same module!');
    } else {
      
        activeEl.className = activeEl.className.replace('active', '');
        target.parentNode.className += 'active';

        decideContent(target.innerHTML);

       
        
    }
}