<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>

.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;
}

 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
 },

 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;
   }
  } 
 },

 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});
  }
 },

 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 || moveX === data.maxMoveX) {
    data.state = (moveX === 0) ? 0 : 3;
    return;
   }
   mainPageLeft = moveX;
   //滑动距离是否超过窗口宽度一半
   if (mainPageLeft > (windowWidth / 2)) {
    translateX = data.maxMoveX - moveX;
    data.state = 3;
   }
   else {
    translateX = -moveX;
    data.state = 0;
   }
  } 
  else if (data.state === 2) {
   if (moveX === 0 || moveX === -data.maxMoveX) {
    data.state = (moveX === 0) ? 3 : 0;
    return;
   }
   //滑动距离是否超过窗口宽度一半
   mainPageLeft = data.maxMoveX + moveX
   if (mainPageLeft > (windowWidth / 2)) {
    translateX = -moveX;
    data.state = 3;
   }
   else {
    translateX = -mainPageLeft;
    data.state = 0;
   }
  }
  translateX += data.lastTranlateX;
  data.lastTranlateX = translateX;
  animation.translateX(translateX).step();
  this.setData({
   animationData:animation.export()
  });
 },

 onMainPageTap: function(e) {
  var data = this.drawerMenuMoveData;
  if (data.state !== 3) {
   return;
  }
  data.state = 0;
  var translateX = -data.maxMoveX;
  translateX += data.lastTranlateX;
  data.lastTranlateX = translateX;
  var animation = wx.createAnimation({duration: 100});
  animation.translateX(translateX).step();
  this.setData({
   animationData:animation.export()
  });
 }