// 拖动悬浮球方法
viewTouchMove:function (e,that) {
var scrolltop = e.currentTarget.dataset.scrolltop;
if (scrolltop==undefined){scrolltop=0;}


console.log(scrolltop)
var screenWidth = wx.getSystemInfoSync().windowWidth;
var screenHeight = wx.getSystemInfoSync().windowHeight + scrolltop;


var movebtnX = e.changedTouches[0].pageX;
var movebtnY = e.changedTouches[0].pageY;
if (movebtnX > 50 && movebtnX < screenWidth & movebtnY > 50 & movebtnY < screenHeight) {
that.setData({
top: movebtnY - scrolltop - 50,
left: movebtnX - 50
})
}
},