<view id="id" class = "ball" bindtap = "handletap" bindtouchstart = "handletouchtart" bindtouchmove="handletouchmove" bindtouchend="handletouchend" style = "width : 100%px; height : 40px;">
 {{text}}
 </view>

.ball {
  box-shadow:2px 2px 10px #AAA;
  border-radius: 20px;
  position: absolute; 
 }

//js
Page({
 data: {
  lastX: 0,     //滑動開始x軸位置
  lastY: 0,     //滑動開始y軸位置
  text: "沒有滑動",
  currentGesture: 0, //標識手勢
 },
 //滑動移動事件
 handletouchmove: function (event) {
  var currentX = event.touches[0].pageX
  var currentY = event.touches[0].pageY
  var tx = currentX - this.data.lastX
  var ty = currentY - this.data.lastY
  var text = ""
  //左右方向滑動
  if (Math.abs(tx) > Math.abs(ty)) {
   if (tx < 0)
    text = "向左滑動"
   else if (tx > 0)
    text = "向右滑動"
  }
  //上下方向滑動
  else {
   if (ty < 0)
    text = "向上滑動"
   else if (ty > 0)
    text = "向下滑動"
  }

  //將當前坐標進行保存以進行下一次計算
  this.data.lastX = currentX
  this.data.lastY = currentY
  this.setData({
   text: text,
  });
 },

 //滑動開始事件
 handletouchtart: function (event) {
  this.data.lastX = event.touches[0].pageX
  this.data.lastY = event.touches[0].pageY
 },
 //滑動結(jié)束事件
 handletouchend: function (event) {
  this.data.currentGesture = 0;
  this.setData({
   text: "沒有滑動",
  });
 },
})