(function($) {
    $.fn.jdMarquee = function(option, callback) {
        if (typeof option == "function") {
            callback = option;
            option = {}
        };
        var s = $.extend({
            deriction: "up",
            speed: 10, 
            auto: true, //设置图片自动切换予否，false为手动切换
            width: null,
            height: null,
            step: 1,
            control: false,
            _front: null,
            _back: null,
            _stop: null,
            _continue: null,
            wrapstyle: "",
            stay: 5000,
            delay: 20,
            dom: "div>ul>li".split(">"),
            mainTimer: null,
            subTimer: null,
            tag: false,
            convert: false,
            btn: null,
            disabled: "disabled",
            pos: {
                ojbect: null,
                clone: null
            }
        },
        option || {});
        var object = this.find(s.dom[1]);
        var subObject = this.find(s.dom[2]);
        var clone;
        if (s.deriction == "up" || s.deriction == "down") {
            var height = object.eq(0).outerHeight();
            var step = s.step * subObject.eq(0).outerHeight();
            object.css({
                width: s.width + "px",
                overflow: "hidden"
            })
        };
        if (s.deriction == "left" || s.deriction == "right") {
            var width = subObject.length * subObject.eq(0).outerWidth();
            object.css({
                width: width + "px",
                overflow: "hidden"
            });
            var step = s.step * subObject.eq(0).outerWidth()
        };
        var init = function() {
            var wrap = "<div style='position:relative;overflow:hidden;z-index:1;width:" + s.width + "px;height:" + s.height + "px;" + s.wrapstyle + "'></div>";
            object.css({
                position: "absolute",
                left: 0,
                top: 0
            }).wrap(wrap);
            s.pos.object = 0;
            clone = object.clone();
            object.after(clone);
            switch (s.deriction) {
            default:
            case "up":
                object.css({
                    marginLeft:
                    0,
                    marginTop: 0
                });
                clone.css({
                    marginLeft: 0,
                    marginTop: height + "px"
                });
                s.pos.clone = height;
                break;
            case "down":
                object.css({
                    marginLeft:
                    0,
                    marginTop: 0
                });
                clone.css({
                    marginLeft: 0,
                    marginTop: -height + "px"
                });
                s.pos.clone = -height;
                break;
            case "left":
                object.css({
                    marginTop:
                    0,
                    marginLeft: 0
                });
                clone.css({
                    marginTop: 0,
                    marginLeft: width + "px"
                });
                s.pos.clone = width;
                break;
            case "right":
                object.css({
                    marginTop:
                    0,
                    marginLeft: 0
                });
                clone.css({
                    marginTop: 0,
                    marginLeft: -width + "px"
                });
                s.pos.clone = -width;
                break
            };
            if (s.auto) {
                initMainTimer();
                object.hover(function() {
                    clear(s.mainTimer)
                },
                function() {
                    initMainTimer()
                });
                clone.hover(function() {
                    clear(s.mainTimer)
                },
                function() {
                    initMainTimer()
                })
            };
            if (callback) {
                callback()
            };
            if (s.control) {
                initControls()
            }
        };
        var initMainTimer = function(delay) {
            clear(s.mainTimer);
            s.stay = delay ? delay: s.stay;
            s.mainTimer = setInterval(function() {
                initSubTimer()
            },
            s.stay)
        };
        var initSubTimer = function() {
            clear(s.subTimer);
            s.subTimer = setInterval(function() {
                roll()
            },
            s.delay)
        };
        var clear = function(timer) {
            if (timer != null) {
                clearInterval(timer)
            }
        };
        var disControl = function(A) {
            if (A) {
                $(s._front).unbind("click");
                $(s._back).unbind("click");
                $(s._stop).unbind("click");
                $(s._continue).unbind("click")
            } else {
                initControls()
            }
        };
        var initControls = function() {
            if (s._front != null) {
                $(s._front).click(function() {
                    $(s._front).addClass(s.disabled);
                    disControl(true);
                    clear(s.mainTimer);
                    s.convert = true;
                    s.btn = "front";
                    initSubTimer();
                    if (!s.auto) {
                        s.tag = true
                    };
                    convert()
                })
            };
            if (s._back != null) {
                $(s._back).click(function() {
                    $(s._back).addClass(s.disabled);
                    disControl(true);
                    clear(s.mainTimer);
                    s.convert = true;
                    s.btn = "back";
                    initSubTimer();
                    if (!s.auto) {
                        s.tag = true
                    };
                    convert()
                })
            };
            if (s._stop != null) {
                $(s._stop).click(function() {
                    clear(s.mainTimer)
                })
            };
            if (s._continue != null) {
                $(s._continue).click(function() {
                    initMainTimer()
                })
            }
        };
        var convert = function() {
            if (s.tag && s.convert) {
                s.convert = false;
                if (s.btn == "front") {
                    if (s.deriction == "down") {
                        s.deriction = "up"
                    };
                    if (s.deriction == "right") {
                        s.deriction = "left"
                    }
                };
                if (s.btn == "back") {
                    if (s.deriction == "up") {
                        s.deriction = "down"
                    };
                    if (s.deriction == "left") {
                        s.deriction = "right"
                    }
                };
                if (s.auto) {
                    initMainTimer()
                } else {
                    initMainTimer(4 * s.delay)
                }
            }
        };
        var setPos = function(y1, y2, x) {
            if (x) {
                clear(s.subTimer);
                s.pos.object = y1;
                s.pos.clone = y2;
                s.tag = true
            } else {
                s.tag = false
            };
            if (s.tag) {
                if (s.convert) {
                    convert()
                } else {
                    if (!s.auto) {
                        clear(s.mainTimer)
                    }
                }
            };
            if (s.deriction == "up" || s.deriction == "down") {
                object.css({
                    marginTop: y1 + "px"
                });
                clone.css({
                    marginTop: y2 + "px"

                })
            };
            if (s.deriction == "left" || s.deriction == "right") {
                object.css({
                    marginLeft: y1 + "px"
                });
                clone.css({
                    marginLeft: y2 + "px"
                })
            }
        };
        var roll = function() {
            var y_object = (s.deriction == "up" || s.deriction == "down") ? parseInt(object.get(0).style.marginTop) : parseInt(object.get(0).style.marginLeft);
            var y_clone = (s.deriction == "up" || s.deriction == "down") ? parseInt(clone.get(0).style.marginTop) : parseInt(clone.get(0).style.marginLeft);
            var y_add = Math.max(Math.abs(y_object - s.pos.object), Math.abs(y_clone - s.pos.clone));
            var y_ceil = Math.ceil((step - y_add) / s.speed);
            switch (s.deriction) {
            case "up":
                if (y_add == step) {
                    setPos(y_object, y_clone, true);
                    $(s._front).removeClass(s.disabled);
                    disControl(false)
                } else {
                    if (y_object <= -height) {
                        y_object = y_clone + height;
                        s.pos.object = y_object
                    };
                    if (y_clone <= -height) {
                        y_clone = y_object + height;
                        s.pos.clone = y_clone
                    };
                    setPos((y_object - y_ceil), (y_clone - y_ceil))
                };
                break;
            case "down":
                if (y_add == step) {
                    setPos(y_object, y_clone, true);
                    $(s._back).removeClass(s.disabled);
                    disControl(false)
                } else {
                    if (y_object >= height) {
                        y_object = y_clone - height;
                        s.pos.object = y_object
                    };
                    if (y_clone >= height) {
                        y_clone = y_object - height;
                        s.pos.clone = y_clone
                    };
                    setPos((y_object + y_ceil), (y_clone + y_ceil))
                };
                break;
            case "left":
                if (y_add == step) {
                    setPos(y_object, y_clone, true);
                    $(s._front).removeClass(s.disabled);
                    disControl(false)
                } else {
                    if (y_object <= -width) {
                        y_object = y_clone + width;
                        s.pos.object = y_object
                    };
                    if (y_clone <= -width) {
                        y_clone = y_object + width;
                        s.pos.clone = y_clone
                    };
                    setPos((y_object - y_ceil), (y_clone - y_ceil))
                };
                break;
            case "right":
                if (y_add == step) {
                    setPos(y_object, y_clone, true);
                    $(s._back).removeClass(s.disabled);
                    disControl(false)
                } else {
                    if (y_object >= width) {
                        y_object = y_clone - width;
                        s.pos.object = y_object
                    };
                    if (y_clone >= width) {
                        y_clone = y_object - width;
                        s.pos.clone = y_clone
                    };
                    setPos((y_object + y_ceil), (y_clone + y_ceil))
                };
                break
            }
        };
        if (s.deriction == "up" || s.deriction == "down") {
            if (height >= s.height && height >= s.step) {
                init()
            }
        };
        if (s.deriction == "left" || s.deriction == "right") {
            if (width >= s.width && width >= s.step) {
                init()
            }
        }
    }
})(jQuery);