急：PC端前两页整屏滑动，第三页起鼠标滚动，怎么实现啊。

koyoyoo

var Touch = {
  ts:undefined,
  dir:undefined,
  scrollTop:0,
  onStart : function(evt) {
    Touch.ts = evt.originalEvent.touches[0].clientY;
  },
  onMove : function(evt){
    var te = evt.originalEvent.changedTouches[0].clientY;
    if (Touch.ts > te) {
      Touch.dir = 'slidedown';
    } else if (Touch.ts < te) {
      Touch.dir = 'slideup';
    }
    //检查滚动
    var $slide = $(this),
      slideHeight = $slide.height(),
      slideScrollHeight = $slide[0].scrollHeight;

    if (slideHeight !== slideScrollHeight) {
      //幻灯片内容溢出
      var scrollTop = $slide.scrollTop();
      if (scrollTop > 0 && (scrollTop + slideHeight) < slideScrollHeight //滚动内容
        ||
        (scrollTop == 0 && Touch.dir == 'slidedown') //从上边缘移动
        ||
        ((scrollTop + slideHeight) == slideScrollHeight && Touch.dir == 'slideup')) { //从下边缘移动
        evt.stopPropagation();
      }
    }
  }
}


$('.j-main-swiper').on('touchstart', Touch.onStart);//j-main-swiper是swiper-wrapper外面的那一个div
$('.swiper-slide').on('touchmove', Touch.onMove);//这是子slide