滑轮滚动穿透问题

滑轮滚动穿透问题

在弹层中若弹框内容过长自带滚动条，在滚动时body内容同样会滚动

$.fn.scrollUnique = function() {
      return $(this).each(function() {
        var eventType = "mousewheel";
        // navigator.userAgent.indexOf(“Firefox”) > -1
        // document.mozHidden !== undefined
        if (navigator.userAgent.indexOf("Firefox") > -1) {
          eventType = "DOMMouseScroll";
        }
        // console.log(eventType)
        $(this).on(eventType, function(event) {
          // 一些数据
          var scrollTop = this.scrollTop,
            scrollHeight = this.scrollHeight,
            height = this.clientHeight;
          var delta = event.originalEvent.wheelDelta
            ? event.originalEvent.wheelDelta
            : -(event.originalEvent.detail || 0);
        //  if ( (delta > 0 && scrollTop <= 0) || (delta < 0 && scrollTop + height >= scrollHeight)) {
            if ((delta > 0 && scrollTop <= delta) || (delta < 0 && scrollHeight - height - scrollTop <= -1 * delta)) {  //原来的
            // 向上滚 || 向下滚
            // event.preventDefault();
            var e = window.event || event;
            if (e.stopPropagation) {
              e.stopPropagation();
            } else {
              e.cancelBubble = true;
            }
            if (e.preventDefault) {
              e.preventDefault();
            } else {
              e.returnValue = false;
            }
          }
        });
      });
    };
    $(".modal .easy-scrollbar__wrap").scrollUnique();