移动端弹窗去掉滚动条

public onShowChange(value: boolean) {
    if (value) {
      document.documentElement.style.position = 'fixed'
      document.body.style.overflow = 'hidden'
      document.body.addEventListener(
        'touchmove',
        event => {
          event.preventDefault()
        },
        false
      )
    } else {
      document.documentElement.style.position = 'static'
      document.body.style.overflow = 'auto'
      document.body.removeEventListener(
        'touchmove',
        event => {
          event.preventDefault()
        },
        false
      )
    }