轮播——向下一整页的滑动

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• html

<div class="p2">
        <div class="p2_p">
            <div class="p2_1 bg1">               
            div>
            <div class="p2_1 bg2">                
            div>
            <div class="p2_1 bg3">         
            div>
            <div class="p2_1 bg4">                             
            div>
            <div class="p2_1 bg5">             
            div>
        div>
    div>

• css

#app .p2{width: 100%;height: 100%;position: absolute;top: 0;left: 0;overflow: hidden}
#app .p2 .p2_p{width: 100%;height: auto;transition: all .5s linear}
#app .p2 .p2_1{width: 100%;height: 100%;position: relative}

• js

    var d=function(h){
        if ($("#app").is(":animated")) {
            return
        }
        if(vm.count<4){
            var m_top=parseInt($(".p2_p").css("margin-top"));
            vm.count=-parseInt(m_top/win_h)+1;
            $(".p2_p").css("margin-top","-"+vm.count*win_h+"px");
        }

    }
    var t=function(h){
        console.log(h)
        if ($("#app").is(":animated")) {
            return
        }
        if(vm.count>0){
            var m_top=parseInt($(".p2_p").css("margin-top"));
            vm.count=-parseInt(m_top/win_h)-1;
            $(".p2_p").css("margin-top","-"+vm.count*win_h+"px");
        }
    }
    var scrollFunc = function (e) {
        var direct = 0;
        e = e || window.event;
        if (e.wheelDelta) {  //判断浏览器IE，谷歌滑轮事件
            if (e.wheelDelta > 0) { //当滑轮向上滚动时
                if(vm.count>0){
                    new t('+='+win_h+'px')
                }
            }
            if (e.wheelDelta < 0) { //当滑轮向下滚动时
               if(vm.count<4){
                   new d('-='+win_h+'px')
               }
            }
        } else if (e.detail) {  //Firefox滑轮事件
            if (e.detail> 0) { //当滑轮向上滚动时
                new t('+='+win_h+'px')
            }
            if (e.detail< 0) { //当滑轮向下滚动时
                new d('-='+win_h+'px')
            }
        }
        event.preventDefault();
        // ScrollText(direct);
    }
     //滚动滑轮触发scrollFunc方法
    window.onmousewheel = document.onmousewheel = scrollFunc;

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