1. export default {
    2.   componentUpdated (el, binding) {
    3.     if (binding.value === undefined) {
    4.       return
    5.     }
    6.     let body = document.body
    7.     if (binding.value) {
    8.       let scrollTop = body.scrollTop || document.documentElement.scrollTop
    9.       document.body.style.cssText += 'position:fixed;width:100%;top:-' + scrollTop + 'px;'
    10.     } else {
    11.       body.style.position = ''
    12.       let top
    13.       if (body.style.top) {
    14.         top = body.style.top
    15.       } else {
    16.         top = document.body.scrollTop || document.documentElement.scrollTop
    17.       }
    18.       document.body.scrollTop = document.documentElement.scrollTop = Math.abs(parseInt(top))
    19.       body.style.top = ''
    20.     }
    21.   }
    22. }