vant/vue手机端长按事件以及禁止长按弹出菜单

@touchstart="start"
      @touchend="end"

start() {
      clearTimeout(this.loop); //再次清空定时器，防止重复注册定时器
      this.loop = setTimeout(() => {
        console.log("长按了");
      }, 1000);
    },
    end() {
      clearTimeout(this.loop); //清空定时器，防止重复注册定时器
    },

* {
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
    document.oncontextmenu = function (e) {
      e.preventDefault();
    };