onTabItemTap在iphone xs不触发，安卓和ios其他机型都可以触发，模拟器iphone xs双击点击可以触发，真机iphone xs不触发onTabItemTap 真机xs 系统13.1不触发 真机学xs 13.6触发

onTabItemTap() {

console.log('xs 不执行-------')

let lasttime = this.lasttime || 0

let nowtime = new Date().getTime()

if (nowtime - lasttime < 350) {

this.onLoad()

}

this.lasttime = nowtime

},