微信小程序-bindtap事件子元素不传参

<ul id="tabBar">
    <li class="{{currentTabBar_s == 10?‘active‘:‘‘}}" data-current="10" bindtap="swichTabN"><image src=‘../../images/icon/tab_MyTodo_s.png‘ class=‘img_s‘></image><image src=‘../../images/icon/tab_MyTodo.png‘ class=‘img_n‘></image><span>待办</span></li>
    <li class="{{currentTabBar_s == 11?‘active‘:‘‘}}" data-current="11" bindtap="swichTabN"><image src=‘../../images/icon/tab_Customers.png‘ class=‘img_n‘></image><image src=‘../../images/icon/tab_Customers.png‘ class=‘img_s‘></image><span>客户</span></li>
    <li class="{{currentTabBar_s == 12?‘active‘:‘‘}}" data-current="12" bindtap="swichTabN"><image src=‘../../images/icon/tab_Find.png‘ class=‘img_n‘></image><image src=‘../../images/icon/tab_Find.png‘ class=‘img_s‘></image><span>发现</span></li>
    <li class="{{currentTabBar_s == 13?‘active‘:‘‘}}" data-current="13" bindtap="swichTabN"><image src=‘../../images/icon/tab_Achieve.png‘ class=‘img_n‘></image><image src=‘../../images/icon/tab_Achieve.png‘ class=‘img_s‘></image><span>业绩</span></li>
  </ul>

 // 点击标题切换当前页时改变样式
  swichTabN: function (e) {
    var _this=this;

    var cur = e.currentTarget.dataset.current;
    console.log(_this.data.currentTabBar_s)
    console.log(_this.data)
    if (this.data.currentTabBar_s == cur) { console.log(123);return false; }
    else {
      console.log(5687)
      this.setData({
        currentTabBar_s: cur
      })
    }
  },