buykey/main/assets/pc/static/expand-slide.js

function ExpandSlide(el, cfg) {
    return new ExpandSlide.prototype.init(el, cfg);
}

ExpandSlide.prototype = {
    constructor: ExpandSlide,
    init: function (el, cfg) {
        var dfs = {
            autoplay: false,
            duration: 500,
            nextBtn: null,
            prevBtn: null,
            wrapper: '.swiper-wrapper',
            panels: '.swiper-slide',
            pagination: '.pagination',
            callback: function () {}
        }

        if (!el) {
            throw Error("请设置wrapper");
        }

        this.cfg = $.extend(dfs, cfg);

        this.container = $(el);
        this.wrapper = el.find(this.cfg.wrapper);
        this.cachePanels = this.wrapper.find(this.cfg.panels);
        this.activeIndex = 0;
        this.initWrapper();

    },
    initWrapper: function () {
        var self = this,
            items = this.wrapper.find(this.cfg.panels),
            len = items.length,
            itemWidth = items.eq(0).width();

        this.itemCount = len;
        this.itemWidth = itemWidth;

        if (len < 3) {
            //throw Error("slideItem小于3个");
            return;
        }

        items.width(itemWidth);
        this.wrapper.width((len + 4) * itemWidth);

        //拷贝节点
        this.wrapper.prepend(items.eq(len - 1).clone());
        this.wrapper.prepend(items.eq(len - 2).clone());
        this.wrapper.append(items.eq(0).clone());
        this.wrapper.append(items.eq(1).clone());

        this.setTranslate(this.wrapper[0], {
            x: -2 * itemWidth
        }, 0);

        this.createPagination(len);
        this.bind();
    },
    createPagination: function (len) {
        var tpl = '',
            cls = '';
        for (var i = 0; i < len; i++) {
            if (i == 0) {
                cls = 'swiper-visible-switch swiper-active-switch';
            } else {
                cls = '';
            }
            tpl += '<span class="swiper-pagination-switch ' + cls + '"></span>';
        }
        this.container.find(this.cfg.pagination).append(tpl);
    },
    bind: function () {
        var self = this;

        var desktopEvents = ['mousedown', 'mousemove', 'mouseup'];
        if (self.browser.ie10) desktopEvents = ['MSPointerDown', 'MSPointerMove', 'MSPointerUp'];
        if (self.browser.ie11) desktopEvents = ['pointerdown', 'pointermove', 'pointerup'];

        self.touchEvents = {
            touchStart: self.support.touch || !self.cfg.simulateTouch ? 'touchstart' : desktopEvents[0],
            touchMove: self.support.touch || !self.cfg.simulateTouch ? 'touchmove' : desktopEvents[1],
            touchEnd: self.support.touch || !self.cfg.simulateTouch ? 'touchend' : desktopEvents[2]
        };

        var bind = self.addEventListener,
            delegateTarget = self.wrapper[0];
        //Touch Events
        if (!(self.browser.ie10 || self.browser.ie11)) {
            if (self.support.touch) {
                bind(delegateTarget, 'touchstart', onTouchStart);
                bind(delegateTarget, 'touchmove', onTouchMove);
                bind(delegateTarget, 'touchend', onTouchEnd);
            } else if (self.cfg.simulateTouch) {
                self.wrapper.on('mousedown', onTouchStart);
                $(document).on('mousemove', onTouchMove);
                $(document).on('mouseup', onTouchEnd);
            }
        } else {
            self.wrapper.on(self.touchEvents.touchStart, onTouchStart);
            $(document).on(self.touchEvents.touchMove, onTouchMove);
            $(document).on(self.touchEvents.touchEnd, onTouchEnd);
        }

        self.touches = {};

        function onTouchStart(e) {
            self.touches.startLeft = self.get3DTranslateLeft(self.wrapper[0]);
            self.touches.dragable = true;
            if (!self.support.touch) {
                self.touches.startX = e.pageX;
                self.touches.startY = e.pageY;
            } else {
                self.touches.startX = e.targetTouches[0].pageX;
                self.touches.startY = e.targetTouches[0].pageY;
            }
            self.stopPlay()
            //e.preventDefault();
        }

        function onTouchMove(e) {
            if (self.touches.dragable) {
                var curX = self.touches.startLeft;
                var toX = 0,
                    movedX = 0,
                    movedY = 0;
                if (!self.support.touch) {
                    // toX = curX-self.touches.startX+e.pageX;
                    movedX = self.touches.startX - e.pageX;
                    movedY = self.touches.startY - e.pageY;
                } else {
                    // toX = curX-self.touches.startX+e.targetTouches[0].pageX;
                    movedX = self.touches.startX - e.targetTouches[0].pageX;
                    movedY = self.touches.startY - e.targetTouches[0].pageY;
                }

                if (Math.abs(movedY) < Math.abs(movedX)) {
                    toX = curX - movedX;
                    self.setTranslate(self.wrapper[0], {
                        x: toX
                    }, 0);
                    e.preventDefault();
                }
            }
        }

        function onTouchEnd(e) {
            if (!self.support.touch) {
                self.touches.startX = e.pageX
            } else {
                self.touches.startX = e.changedTouches[0].pageX;
            }
            self.touches.dragable = false;
            var curLeft = self.get3DTranslateLeft(self.wrapper[0]);
            if (self.touches.startLeft - curLeft < -self.itemWidth / 10) {
                self.prev();
            } else if (self.touches.startLeft - curLeft > self.itemWidth / 10) {
                self.next();
            } else {
                self.restore();
            }
            self.startPlay();
            e.preventDefault();
        }


        this.cfg.nextBtn.click(function () {
            self.next();
        }).on('mouseenter', function () {
            self.stopPlay()
        }).on('mouseleave', function () {
            if (self.cfg.autoplay) {
                self.startPlay();
            }
        })

        this.cfg.prevBtn.click(function () {
            self.prev();
        }).on('mouseenter', function () {
            self.stopPlay()
        }).on('mouseleave', function () {
            if (self.cfg.autoplay) {
                self.startPlay();
            }
        })

        this.wrapper.on('mouseenter', function () {
            self.stopPlay()
        }).on('mouseleave', function () {
            if (self.cfg.autoplay) {
                self.startPlay();
            }
        })
        this.container.find(self.cfg.pagination).on('click', 'span', function () {
            self.swipeTo($(this).index())
            return false;
        })

        if (this.cfg.autoplay) {
            this.startPlay();
        }
    },
    startPlay: function () {
        var self = this;
        this.stopPlay();
        this.autoInterval = setInterval(function () {
            self.next();
        }, this.cfg.autoplay * 1000)
    },
    stopPlay: function () {
        clearInterval(this.autoInterval);
    },
    restore: function () {
        var self = this;

        this.setTranslate(this.wrapper[0], {
            x: -(2 + this.activeIndex) * this.itemWidth
        }, this.cfg.duration, function () {});
    },
    moving: false,
    next: function () {
        var self = this;
        if (this.moving) return;
        this.moving = true;
        this.activeIndex++;

        this.doSwipe();
    },
    prev: function () {
        var self = this;

        if (this.moving) return;
        this.moving = true;
        this.activeIndex--;

        this.doSwipe();
    },
    swipeTo: function (activeIndex) {
        var self = this;

        if (this.moving) return;
        this.moving = true;
        this.activeIndex = activeIndex;

        this.doSwipe();
    },
    doSwipe: function () {
        var self = this;
        this.setTranslate(this.wrapper[0], {
            x: -(2 + this.activeIndex) * this.itemWidth
        }, this.cfg.duration, function () {
            if (self.activeIndex <= -1) {
                self.activeIndex = self.itemCount - 1;
                self.setTranslate(self.wrapper[0], {
                    x: -(2 + self.activeIndex) * self.itemWidth
                }, 0);
            }
            if (self.activeIndex >= self.itemCount) {
                self.activeIndex = 0;
                self.setTranslate(self.wrapper[0], {
                    x: -(2 + self.activeIndex) * self.itemWidth
                }, 0);
            }
            self.moving = false;
            self.container.find(self.cfg.pagination).find('span').removeClass('swiper-visible-switch swiper-active-switch').eq(self.activeIndex).addClass('swiper-visible-switch swiper-active-switch');
            self.cfg.callback(self);
        });
    },
    wrapperTransitionEnd: function (callback) {
        'use strict';
        var a = this,
            el = a.wrapper[0],
            events = ['webkitTransitionEnd', 'transitionend', 'oTransitionEnd', 'MSTransitionEnd', 'msTransitionEnd'],
            i;

        function fireCallBack(e) {
            if (e.target !== el) return;
            callback(a);
            for (i = 0; i < events.length; i++) {
                a.removeEventListener(el, events[i], fireCallBack);
            }
        }

        if (callback) {
            for (i = 0; i < events.length; i++) {
                this.addEventListener(el, events[i], fireCallBack);
            }
        }
    },
    setTranslate: function (el, translate, duration, fcallback) {
        'use strict';
        var callback = fcallback || function () {};
        var es = el.style;
        var pos = {
            x: translate.x || 0,
            y: translate.y || 0,
            z: translate.z || 0
        };

        this.setTransition(el, duration);
        var transformString = this.support.transforms3d ? 'translate3d(' + (pos.x) + 'px,' + (pos.y) + 'px,' + (pos.z) + 'px)' : 'translate(' + (pos.x) + 'px,' + (pos.y) + 'px)';
        if (this.support.transforms) {
            es.webkitTransform = es.MsTransform = es.msTransform = es.MozTransform = es.OTransform = es.transform = transformString;
        }
        //alert(this.support.transforms)
        if (!this.support.transforms) {
            $(el).animate({
                left: pos.x,
                top: pos.y
            }, duration, callback)
        } else {
            if (duration) {
                this.wrapperTransitionEnd(function () {
                    callback()
                })
            } else {
                callback()
            }
        }
    },
    get3DTranslateLeft: function (el) {
        'use strict';
        var es = el.style;
        if (!this.support.transforms) {
            return $(el).css('left');
        } else {
            var translateStr = es.webkitTransform || es.MsTransform || es.msTransform || es.MozTransform || es.OTransform || es.transform;
            return translateStr.match(/translate3d\((-*\d*)px/)[1];
        }
    },
    setTransition: function (el, duration) {
        'use strict';
        var es = el.style;
        es.webkitTransitionDuration = es.MsTransitionDuration = es.msTransitionDuration = es.MozTransitionDuration = es.OTransitionDuration = es.transitionDuration = duration + 'ms';
    },
    support: {

        touch: (window.Modernizr && Modernizr.touch === true) || (function () {
            'use strict';
            return !!(('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch);
        })(),

        transforms3d: (window.Modernizr && Modernizr.csstransforms3d === true) || (function () {
            'use strict';
            var div = document.createElement('div').style;
            var ret = ('webkitPerspective' in div || 'MozPerspective' in div || 'OPerspective' in div || 'MsPerspective' in div || 'perspective' in div);
            ret = !$.browser.msie || ($.browser.msie && Number($.browser.version) > 9);
            return ret;
        })(),

        transforms: (window.Modernizr && Modernizr.csstransforms === true) || (function () {
            'use strict';
            var div = document.createElement('div').style;
            var ret = ('transform' in div || 'WebkitTransform' in div || 'MozTransform' in div || 'msTransform' in div || 'MsTransform' in div || 'OTransform' in div);
            ret = !$.browser.msie || ($.browser.msie && Number($.browser.version) > 9);
            return ret;
        })(),

        transitions: (window.Modernizr && Modernizr.csstransitions === true) || (function () {
            'use strict';
            var div = document.createElement('div').style;
            var ret = ('transition' in div || 'WebkitTransition' in div || 'MozTransition' in div || 'msTransition' in div || 'MsTransition' in div || 'OTransition' in div);
            ret = !$.browser.msie || ($.browser.msie && Number($.browser.version) > 9);
            return ret;
        })(),

        classList: (function () {
            'use strict';
            var div = document.createElement('div').style;
            return 'classList' in div;
        })()
    },
    browser: {
        ie8: (function () {
            'use strict';
            var rv = -1; // Return value assumes failure.
            if (navigator.appName === 'Microsoft Internet Explorer') {
                var ua = navigator.userAgent;
                var re = new RegExp(/MSIE ([0-9]{1,}[\.0-9]{0,})/);
                if (re.exec(ua) !== null)
                    rv = parseFloat(RegExp.$1);
            }
            return rv !== -1 && rv < 9;
        })(),

        ie10: window.navigator.msPointerEnabled,
        ie11: window.navigator.pointerEnabled
    },
    addEventListener: function (el, event, listener, useCapture) {
        'use strict';
        if (typeof useCapture === 'undefined') {
            useCapture = false;
        }

        if (el.addEventListener) {
            el.addEventListener(event, listener, useCapture);
        } else if (el.attachEvent) {
            el.attachEvent('on' + event, listener);
        }
    },

    removeEventListener: function (el, event, listener, useCapture) {
        'use strict';
        if (typeof useCapture === 'undefined') {
            useCapture = false;
        }

        if (el.removeEventListener) {
            el.removeEventListener(event, listener, useCapture);
        } else if (el.detachEvent) {
            el.detachEvent('on' + event, listener);
        }
    }
}

ExpandSlide.prototype.init.prototype = ExpandSlide.prototype;