vue弹框产生的滚动穿透问题的解决

.noscroll{
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
}

export function hasClass(el, className) {
  let reg = new RegExp('(^|\\s)' + className + '(\\s|$)')
  return reg.test(el.className)
}
 
export function addClass(el, className) {
  if (hasClass(el, className)) {
    return
  }
  if(el.className === ''){
    el.className += className
  }else{
    let newClass = el.className.split(' ')
    newClass.push(className)
    el.className = newClass.join(' ')
  }
  
}

export function removeClass(el,className) {
  if (hasClass(el, className)) {
    el.className = el.className.replace(new RegExp('(\\s|^)' + className + '(\\s|$)'), '');
  };
}

this.htmlDom = document.getElementsByTagName('html')[0];

addClass(this.htmlDom, 'noscroll');

removeClass(this.htmlDom, 'noscroll');