JavaScript实现移动端弹窗后禁止滚动

puted:{
  popupStatus(){
    return this.SendCircle_visible || this.generateInfo_visible || this.isPosterShow;
  }
},
methods:{
  sTouch(e){
    e.preventDefault();
  },
},
watch: { 
  popupStatus(val) {
    let preD = this.sTouch;
    let options = { 
      passive: false, //强调默认事件
      capture: true, //早点禁止该事件 
    };
    if (val) {
      document.body.style.overflow = 'hidden';
      document.addEventListener('touchmove', preD, options); // 禁止页面滑动
    } else {
      document.body.style.overflow = ''; // 出现滚动条
      document.removeEventListener('touchmove', preD, options);
    }
  }
}