在涉及的input中设置blur事件，事件里具体使用的方法如下

setTimeout(() => {
  window.scrollTo(0, 0)
}, 100)

如果当前页面有多个

inputFocus (index) {
  this.lastFocusInputIndex = index
},
inputBlur (index) {
  let self = this
  self.lastFocusInputIndex = index
  setTimeout(() => {
    self.checkInputBlur(index)
  }, 100)
},
checkInputBlur (lastIndex) {
  if (this.lastFocusInputIndex === lastIndex) {
    window.scrollTo(0, 0)
    this.lastFocusInputIndex = -1
  }
}

网上看到的方法二

(function () {
  let myFunction
  let isWXAndIos = isWeiXinAndIos()
  if (isWXAndIos) {
    document.body.addEventListener('focusin', () => {
      clearTimeout(myFunction)
    })
    document.body.addEventListener('focusout', () => {
      clearTimeout(myFunction)
      myFunction = setTimeout(function() {
        window.scrollTo({top: 0, left: 0, behavior: 'smooth'})
      }, 200)
    })
  }
})()

function isWeiXinAndIos () {
  let ua = '' + window.navigator.userAgent.toLowerCase()
  let isWeixin = /MicroMessenger/i.test(ua)
  let isIos = /\(i[^;]+;( U;)? CPU.+Mac OS X/i.test(ua)
  return isWeixin && isIos
}

最近使用的方法三

var u = navigator.userAgent
var sAndroid = u.indexOf('Android') > -1 || u.indexOf('Adr') > -1
// var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/)
// 安卓
if (isAndroid) {
    window.addEventListener('resize', function() {
        if (document.activeElement.tagName == "INPUT") {
            window.setTimeout(function() {
                document.activeElement.scrollIntoViewIfNeeded() // 异常时可以用 document.activeElement.scrollIntoView(false)
            }, 0)
        }
    })
}
function inputFocus (type) {
    console.log('focus type === ', type)
}
function inputBlur (type) {
    console.log('blur type === ', type)
    setTimeout(() => {
        window.scrollTo(0, 0)
    }, 100)
}