Stutter appears in Mini Program animation.

Mini Program is written in wepy framework, but there is stutter. I don"t know what"s wrong with this code 

// 
getOrderHeight() {
    var query = wx.createSelectorQuery()
    query.select(".paymask-detail").boundingClientRect()
    query.exec((res) => {
        this.paymaskDetailHeight = -res[0].height + "px" // list
        this.$apply()
        console.log(this.paymaskDetailHeight)
    })
}
animationFn() {
    // 
    let animationUpIn = wx.createAnimation({
        duration: 150,
        timingFunction: "ease"
    })
    animationUpIn.translateY(this.paymaskDetailHeight).step()
    this.animationUpIn = animationUpIn.export()
    // 
    let animationFadeIn = wx.createAnimation({
        duration: 200,
        timingFunction: "ease"
    })
    animationFadeIn.opacity(1).step()
    this.animationFadeIn = animationFadeIn.export()
    this.$apply()
}
Javascript Mini-Program
Nov.30,2021

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