微信小程序开发之抽屉菜单案例详细说明

<view id='id-main-page' class='main-page' animation='{{animationData}}' style='left:{{mainPageLeft}}rpx;'
 bindtouchstart='onMainPageTouchstart' catchtouchmove='onMainPageTouchmove' bindtouchend='onMainPageTouchend' bindtap='onMainPageTap'>
  <view class="userinfo">
    <image class="userinfo-avatar" src="{{userInfo.avatarUrl}}" background-size="cover"></image>
    <text class="userinfo-nickname">{{userInfo.nickName}}</text>
  </view>
</view>
<view class='drawer-menu' animation='{{animationData}}' style='left:{{drawerMenuLeft}}rpx;'>
  <view class="userinfo">
    <image class="userinfo-avatar" src="{{userInfo.avatarUrl}}" background-size="cover"></image>
    <text class="userinfo-nickname">{{userInfo.nickName2}}</text>
  </view>
</view>

index.wxss

.main-page {
  width:100%;
  height:2000rpx;
  position: absolute;
  top: 0;
  left: 0;
  padding: 200rpx 0;
}

.drawer-menu {
  width: 800rpx;
  height:2000rpx;
  position: absolute;
  top: 0;
  left: -800rpx;
  padding: 200rpx 0;
  background: rgba(22, 22, 22, 1);
  z-index: 800;
}
程序绑定了主页的touch事件和tap事件，并且使用catchtouchmove阻止了move事件的传递，因为在真机环境下页面会自动响应滑动事件，注意不要catch start和end事件，这会导致无法触发tap事件。
首先定义一些数据来记录滑动过程和状态
  drawerMenuMoveData: {
    check: false,   //是否触发滑动操作
    state:0,    //0:初始状态 1:菜单弹出中状态 2:菜单弹入状态中 3:菜单弹出状态
    firstTouchX:0,  //首次触摸X坐标值
    touchCheckX:60,  //触发滑动的触摸X
    moveX:0,   // 滑动操作横向的移动距离
    maxMoveX: (app.globalData.deviceInfo.windowWidth - 60), //抽屉菜单最大移动距离
    lastTranlateX: 0  //上次动画效果的平移距离，用于校准left值
  },
之后就是滑动事件的响应处理
touchstart事件，首先判断当前状态，然后根据触摸位置判断是否激活滑动状态
  onMainPageTouchstart: function(e) {
    var data = this.drawerMenuMoveData;
    var clientX = e.touches[0].clientX;
    //初识状态
    if (data.state === 0) {
      if (clientX <= data.touchCheckX && clientX > 20) {
        data.check = true;
        data.state = 1;
        data.firstTouchX = clientX;
      }
    }
    //菜单弹出状态
    else if (data.state === 3) {
      if (clientX >= data.maxMoveX) {
        data.check = true;
        data.state = 2;
        data.firstTouchX = clientX;
      }
    } 
  },
touchmove 事件，首先判断是否处于滑动状态，之后根据当前模式来计算主页和菜单页的left值来产生滑动效果
  onMainPageTouchmove: function(e) {
    var data = this.drawerMenuMoveData;
    var pixelRatio = app.globalData.deviceInfo.pixelRatio;
    if (data.check) {
      var mainPageLeft = 0, drawerMenuLeft = 0;
      var moveX = e.touches[0].clientX - data.firstTouchX;
      if (data.state === 1)
      {
        //处理边界状态
        if (moveX < 0) {
          moveX = 0;
        }
        if (moveX > data.maxMoveX) {
          moveX = data.maxMoveX;
        }
        if (moveX >= 0 && moveX <= data.maxMoveX) {
          data.moveX = moveX;
          moveX = moveX - data.lastTranlateX;
          //px转为rpx
          moveX = moveX * pixelRatio;
          mainPageLeft = moveX;
          drawerMenuLeft = -800 + moveX;
        }
      }
      else if (data.state === 2) {
        //处理边界状态
        if (moveX > 0) {
          moveX = 0;
        }
        if (moveX < -data.maxMoveX) {
          moveX = -data.maxMoveX; 
        }
        if (moveX <= 0 && moveX >= -data.maxMoveX) {
          data.moveX = moveX;
          moveX = moveX - data.lastTranlateX;
          //px转为rpx
          moveX = moveX * pixelRatio;
          var maxMoveX = data.maxMoveX * pixelRatio;
          mainPageLeft = maxMoveX + moveX;
          drawerMenuLeft = maxMoveX -800 + moveX;
        }
      }

      this.setData({mainPageLeft: mainPageLeft, 
                    drawerMenuLeft: drawerMenuLeft});
    }
  },
touchend事件 根据滑动的距离来判断菜单是否弹出，并创建滑动动画
 onMainPageTouchend: function(e) {
    var data = this.drawerMenuMoveData;
    if (!data.check) {
      return;
    }
    data.check = false;
    data.firstTouchX = 0;
    var moveX = data.moveX;
    data.moveX = 0;
    var animation = wx.createAnimation({duration: 100});
    var translateX = 0;
    var mainPageLeft = 0;
    var windowWidth = app.globalData.deviceInfo.windowWidth;
    if (data.state === 1)
    {
      if (moveX === 0   
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