手机端滑屏翻页，页面元素动画

摘要：引入文件页面结构控制翻屏逻辑直接跳到第页设置滑动页面的统一样式

//     Zepto.js
//     (c) 2010-2014 Thomas Fuchs
//     Zepto.js may be freely distributed under the MIT license.

;(function($){
    var touch = {},
        touchTimeout, tapTimeout, swipeTimeout, longTapTimeout,
        longTapDelay = 750,
        gesture

    function swipeDirection(x1, x2, y1, y2) {
        return Math.abs(x1 - x2) >=
        Math.abs(y1 - y2) ? (x1 - x2 > 0 ? "Left" : "Right") : (y1 - y2 > 0 ? "Up" : "Down")
    }

    function longTap() {
        longTapTimeout = null
        if (touch.last) {
            touch.el.trigger("longTap")
            touch = {}
        }
    }

    function cancelLongTap() {
        if (longTapTimeout) clearTimeout(longTapTimeout)
        longTapTimeout = null
    }

    function cancelAll() {
        if (touchTimeout) clearTimeout(touchTimeout)
        if (tapTimeout) clearTimeout(tapTimeout)
        if (swipeTimeout) clearTimeout(swipeTimeout)
        if (longTapTimeout) clearTimeout(longTapTimeout)
        touchTimeout = tapTimeout = swipeTimeout = longTapTimeout = null
        touch = {}
    }

    function isPrimaryTouch(event){
        return (event.pointerType == "touch" ||
            event.pointerType == event.MSPOINTER_TYPE_TOUCH)
            && event.isPrimary
    }

    function isPointerEventType(e, type){
        return (e.type == "pointer"+type ||
        e.type.toLowerCase() == "mspointer"+type)
    }

    $(document).ready(function(){
        var now, delta, deltaX = 0, deltaY = 0, firstTouch, _isPointerType

        if ("MSGesture" in window) {
            gesture = new MSGesture()
            gesture.target = document.body
        }

        $(document)
            .bind("MSGestureEnd", function(e){
                var swipeDirectionFromVelocity =
                    e.velocityX > 1 ? "Right" : e.velocityX < -1 ? "Left" : e.velocityY > 1 ? "Down" : e.velocityY < -1 ? "Up" : null;
                if (swipeDirectionFromVelocity) {
                    touch.el.trigger("swipe")
                    touch.el.trigger("swipe"+ swipeDirectionFromVelocity)
                }
            })
            .on("touchstart MSPointerDown pointerdown", function(e){
                if((_isPointerType = isPointerEventType(e, "down")) &&
                    !isPrimaryTouch(e)) return
                //console.log(e);
                firstTouch = _isPointerType ? e : e.originalEvent.touches[0]
                if (e.touches && e.touches.length === 1 && touch.x2) {
                    // Clear out touch movement data if we have it sticking around
                    // This can occur if touchcancel doesn"t fire due to preventDefault, etc.
                    touch.x2 = undefined
                    touch.y2 = undefined
                }
                now = Date.now()
                delta = now - (touch.last || now)
                touch.el = $("tagName" in firstTouch.target ?
                    firstTouch.target : firstTouch.target.parentNode)
                touchTimeout && clearTimeout(touchTimeout)
                touch.x1 = firstTouch.pageX
                touch.y1 = firstTouch.pageY
                if (delta > 0 && delta <= 250) touch.isDoubleTap = true
                touch.last = now
                longTapTimeout = setTimeout(longTap, longTapDelay)
                // adds the current touch contact for IE gesture recognition
                if (gesture && _isPointerType) gesture.addPointer(e.pointerId);
            })
            .on("touchmove MSPointerMove pointermove", function(e){
                // e.preventDefault()
                if((_isPointerType = isPointerEventType(e, "move")) &&
                    !isPrimaryTouch(e)) return
                firstTouch = _isPointerType ? e : e.originalEvent.touches[0]
                cancelLongTap()
                touch.x2 = firstTouch.pageX
                touch.y2 = firstTouch.pageY

                deltaX += Math.abs(touch.x1 - touch.x2)
                deltaY += Math.abs(touch.y1 - touch.y2)
            })
            .on("touchend MSPointerUp pointerup", function(e){
                if((_isPointerType = isPointerEventType(e, "up")) &&
                    !isPrimaryTouch(e)) return
                cancelLongTap()

                // swipe
                if ((touch.x2 && Math.abs(touch.x1 - touch.x2) > 30) ||
                    (touch.y2 && Math.abs(touch.y1 - touch.y2) > 30))

                    swipeTimeout = setTimeout(function() {
                        touch.el.trigger("swipe")
                        touch.el.trigger("swipe" + (swipeDirection(touch.x1, touch.x2, touch.y1, touch.y2)))
                        touch = {}
                    }, 0)

                // normal tap
                else if ("last" in touch)
                // don"t fire tap when delta position changed by more than 30 pixels,
                // for instance when moving to a point and back to origin
                    if (deltaX < 30 && deltaY < 30) {
                        // delay by one tick so we can cancel the "tap" event if "scroll" fires
                        // ("tap" fires before "scroll")
                        tapTimeout = setTimeout(function() {

                            // trigger universal "tap" with the option to cancelTouch()
                            // (cancelTouch cancels processing of single vs double taps for faster "tap" response)
                            var event = $.Event("tap")
                            event.cancelTouch = cancelAll
                            touch.el.trigger(event)

                            // trigger double tap immediately
                            if (touch.isDoubleTap) {
                                if (touch.el) touch.el.trigger("doubleTap")
                                touch = {}
                            }

                            // trigger single tap after 250ms of inactivity
                            else {
                                touchTimeout = setTimeout(function(){
                                    touchTimeout = null
                                    if (touch.el) touch.el.trigger("singleTap")
                                    touch = {}
                                }, 250)
                            }
                        }, 0)
                    } else {
                        touch = {}
                    }
                deltaX = deltaY = 0

            })
            // when the browser window loses focus,
            // for example when a modal dialog is shown,
            // cancel all ongoing events
            .on("touchcancel MSPointerCancel pointercancel", cancelAll)

        // scrolling the window indicates intention of the user
        // to scroll, not tap or swipe, so cancel all ongoing events
        $(window).on("scroll", cancelAll)

    });
    
    ["swipe", "swipeLeft", "swipeRight", "swipeUp", "swipeDown",
        "doubleTap", "tap", "singleTap", "longTap"].forEach(function(eventName){
            $.fn[eventName] = function(callback){ return this.on(eventName, callback) }
        })

    document.addEventListener("touchmove", function(event) {
        event.preventDefault();
    }, { passive: false });
})(jQuery)

var pageLength = $(".page").length;
$(".wrapper").bind("swipeUp", function () {
    pageNum++;
    if (pageNum > pageLength) {
        pageNum = pageLength;
        return
    }
    toPage(pageNum - 1, pageNum);
}).bind("swipeDown", function () {
    pageNum--;
    if (pageNum <= 0) {
        pageNum = 1;
        return
    }
    toPage(pageNum + 1, pageNum);
});
$(".page2-btn").click(function(){
    directTo(3); // 直接跳到第3页
});
function toPage(currentNum, nextNum) {
    if (swipeFlag) {
        return
    }
    swipeFlag = true;
    setTimeout(function () {
        $(".page").removeClass("active");
        $(".page" + nextNum).addClass("active");
        // if (nextNum == 2) {
        //     setTimeout(function () {
        //         $(".hand").fadeIn();
        //     }, 2000)
        // } else {
        //     $(".hand").fadeOut();
        // }
        swipeFlag = false;
    } , 1400);  
}
function directTo(pageNum) {
    $(".page").removeClass("active");
    $(".page" + pageNum).addClass("active");
}

$speed: 1;
$durations: 1s;
html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #141a28;
}
.pages {
    width: 100%;
    height: 100%;
    position: relative;
}

.page {
    display: none;
    /*滑动页面的统一样式 */
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    // transform: translate3d(0px, 100%, 0px);
    // -webkit-transform: translate3d(0px, 100%, 0px);
    transition: all .5s ease-out;
    -webkit-transition: all .5s ease-out;
}
.active {
    display: block !important;
}
.active{
    animation: pageFadeIn .5s ease-out both;
    -webkit-animation: pageFadeIn .5s ease-out both;
}
.page1.active{
    .page1-img1{
        -webkit-animation: pulse $durations 1s * $speed ease-out backwards;
        animation: pulse $durations 1s * $speed ease-out backwards;
    }
    .page1-img2{
        -webkit-animation: fadeIn $durations .5s * $speed ease-out backwards;
        animation: fadeIn $durations .5s * $speed ease-out backwards;
    }
    .page1-img3{
        -webkit-animation: fadeIn $durations 1.5s * $speed ease-out backwards;
        animation: fadeIn $durations 1.5s * $speed ease-out backwards;
    }
}
@keyframes pulse {
    0% {
        opacity: 0;
        transform: scaleX(1)
    }

    50% {
        transform: scale3d(1.05,1.05,1.05)
    }

    to {
        opacity: 1;
        transform: scaleX(1)
    }
}
@keyframes fadeIn {
    0% {
        opacity: 0
    }

    to {
        opacity: 1
    }
}