goTop () {
cancelAnimationFrame(this.timer)
const self = this
self.timer = requestAnimationFrame(function fn () {
const oTop = document.body.scrollTop || document.documentElement.scrollTop
if (oTop > 0) {
document.body.scrollTop = document.documentElement.scrollTop = oTop - 50
self.timer = requestAnimationFrame(fn)
} else {
cancelAnimationFrame(self.timer)
}
})
}
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