onPageScroll: function (e) {

var that = this

//如果是点击菜单弹窗，则滚动时候不隐藏菜单

if (e.scrollTop>=230&&!this.data.showMenu) {

that.setData({

showMenu: true

})

}

else if (e.scrollTop < 430 && this.data.showMenu) {

that.setData({

showMenu: false

})

}

}

根据showMenu 来显示隐藏菜单