小程序简单收缩菜单

      <view bindtap="bindIsDown" class="nav-Title" data-isdown="{{isDown}}"  >
        <text class="nav-titles">2222</text>
        <image src="../../image/exam/{{isDown==0?'down':'up'}}.png"></image>
      </view>
      <view class="navCont" hidden="{{isDown==0?true:false}}">
        <view class="sidebar-Left" bindtap="bindIsDown">
          <view bindtap='change' >
            <text>99999</text>
          </view>
        </view>
      </view>

  bindIsDown: function (t) {
    var that = this,
        e = t.currentTarget.dataset.isdown;
    e = 0 == e ? 1 : 0, that.setData({
        isDown: e
    });
},