uniapp如何开启上下拉

//在pages.json中找到需要开启的页面. 在style中输入
"enablePullDownRefresh": true,

onPullDownRefresh () {
    //刷新初始化数据
    this.size = 10
    this.current = 1 
    //调用获取数据的函数
    this.getData() 
    //关闭刷新动画
    setTimeout(function () {
        uni.stopPullDownRefresh() 
    }, 1000)
},

const SIZE = 10
data(){
return {
size: 10,
current: 1
}
}
//上拉加载函数
onReachBottom(){
    let that = this
    //每次上拉加载的数据比上一次多十个
    that.size += SIZE
    setTimeout(()=>{
        that.getData()
    },1000)
}