摘要：前段時間公司做一個線上活動，在電視上商品促銷。文件滾動第一屏滾動最后一屏滾動上下滾動鍵啟動第一屏滾動最后一屏滾動樣式側邊欄倒計時下拉箭頭最終效果

前段時間公司做一個線上活動，在電視上商品促銷。產品的要求是每個商品介紹剛好滿一屏，按下遙控器向下鍵可以整屏切換。這種功能如果實在PC端，實現起來非常容易，引用jQuery插件就能實現。但是在安卓智能電視上就會有許多兼容性問題，因為各種廠家生產的電視機盒子、智能電視系統都不一樣。下面主要介紹一下我的這個項目。
下面是整個HTML代碼

    
    
    
    
    
    
    
    




    

        

        

        

        

        

        

    




    

        
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首先需要引用jQuery，onepage.js就整屏滾動插件，jquery.downCount.js是倒計時插件。

onepage.js文件

function startOnePage(myInput){
    "use strict";

    var settings = myInput;

    // input values
    var frame = $(settings.frame),
        container = $(settings.container),
        sections = $(settings.sections),
        speed = settings.speed || 500,
        radio = $(settings.radio),
        radioOn = $(settings.radioOn),
        easing = settings.easing || "swing";

    /* 
        Boolean values to enable/disable default scroll action
        linked to
            1) init()
            2) animateScr()
            3) scroll, keydown bound event handler
        default: true;
    */
    var didScroll = true,
        isFocused = true;

    // common variables
    var height = $(window).height();

    // Index values for sections elements
    var totalSections = sections.length - 1;

    // currently displayed section number
    // modifying this variable will cause buggy behaviors.
    var num = 0; 

    // keyboard input values
    // add more if necessary
    var pressedKey = {};
        pressedKey[36] = "top"; // home
        pressedKey[38] = "up"; // upward arrow
        pressedKey[40] = "down"; // downward arrow
        pressedKey[33] = "up"; // page up
        pressedKey[34] = "down"; // page down
        pressedKey[35] = "bottom"; // end


    // init function to initialize/reassign values of the variables
    // to prevent section misplacement caused by a window resize.
    function init(){
        height = $(window).height();
        frame.css({"overflow":"hidden", "height": height + "px"});
        sections.css({"height": height + "px"});
        didScroll = true;
        isFocused = true;
        end = - height * ( totalSections );

        
        container.stop().animate({marginTop : 0}, 0, easing, function(){
            num = 0;
            didScroll = true;
            turnOnRadio(0, 0);
        });
    }
    // event binding to init function
    $(window).bind("load resize", init);
    

    // animate scrolling effect
    var now, end;
    function animateScr(moveTo, duration, distance){
        var top;
        duration = duration || speed;
        switch(moveTo){
            case "down":
                top = "-=" + ( height * distance ) + "px";
                num += distance;
                break;
            case "up":
                top = "+=" + ( height * distance ) + "px";
                num -= distance;
                break;
            case "bottom":
                top = end;
                num = totalSections;
                break;
            case "top":
                top = 0;
                num = 0;
                break;
            default: console.log("(error) wrong argument passed"); return false;
        }

        container.not(":animated").animate({marginTop : top}, duration, easing, function(){
            didScroll = true;
        });

        if(radio){turnOnRadio(num, speed);}
    }

    // show active radio button
    function turnOnRadio(index, duration){
        duration = duration || speed;
        radioOn.stop().animate({"top": index * radioOn.outerHeight( true )+ "px"}, speed, easing);
    }

    radio.children("li:not(" + settings.radioOn + ")").click(function(){
        var to = $(this).index();
        var dif = Math.abs( num - to );

        // if(num < to){
        //     animateScr("down", speed, dif);
        // }else if(num > to){
        //     animateScr("up", speed, dif);
        // }
    });

    /*    
        1. get a type of event and handle accordingly
        2. enable/disable default keyboard behavior
    */
    $(document).bind("DOMMouseScroll mousewheel keydown", function(e){
        var eType = e.type;

        now = parseInt( container.css("marginTop") );
        end = - height * ( totalSections );

        // handles the event
        if( didScroll && isFocused ){
            // prevent multiple event handling
            didScroll = false;

            // on wheel
            if( eType == "DOMMouseScroll" || eType == "mousewheel" ){

                var mvmt = e.originalEvent.wheelDelta;
                if(!mvmt){ mvmt = -e.originalEvent.detail; }

                // 滾動
                if(mvmt > 0){
                    //第一屏滾動
                    if( now == 0){
                        didScroll = true;
                    }else{
                        animateScr("up", 500, 1);
                    }
                }else if(mvmt < 0){
                    //最后一屏滾動
                    if( now == end ){
                        didScroll = true;
                    }else{
                        animateScr("down", 500, 1);
                    }
                }else{
                    didScroll = true; 
                }
            }
            // on keydown
            else if( eType == "keydown" ){
                // 上下滾動鍵啟動
                if( pressedKey[e.which] ){
                    e.preventDefault();
                    if( pressedKey[e.which] == "up" ){
                        // 第一屏滾動
                        if( now == 0 ){
                            animateScr("bottom");
                        }else{
                            animateScr("up", speed, 1);
                        }
                    }else if( pressedKey[e.which]  == "down" ){
                        //最后一屏滾動
                        if( now == end ){
                            animateScr("top");
                        }else{
                            animateScr("down", speed, 1);
                        }
                    }else{
                        // page down  page up
                        animateScr( pressedKey[e.which] );
                    }
                }else{
                    didScroll = true;
                }
            }
        }

        // enable default keyboard behavior when an input or textarea is being focused
        $("input, textarea").focus(function(){isFocused = false;})
                            .blur(function(){isFocused = true;});
    });

}

jquery.downCount.js

(function ($) {
    $.fn.downCount = function (options, callback) {
        var settings = $.extend({
                date: null,
                offset: null
            }, options);

        // Throw error if date is not set
        if (!settings.date) {
            $.error("Date is not defined.");
        }

        // Throw error if date is set incorectly
        if (!Date.parse(settings.date)) {
            $.error("Incorrect date format, it should look like this, 12/24/2012 12:00:00.");
        }

        // Save container
        var container = this;

        /**
         * Change client"s local date to match offset timezone
         * @return {Object} Fixed Date object.
         */
        var currentDate = function () {
            // get client"s current date
            var date = new Date();

            // turn date to utc
            // var utc = date.getTime() + (date.getTimezoneOffset() * 60000);
            var utc = date.getTime();

            // set new Date object
            // var new_date = new Date(utc + (3600000*settings.offset));
            var new_date = new Date(utc);

            return new_date;
            // return date;
        };

        /**
         * Main downCount function that calculates everything
         */
        function countdown () {
            var target_date = new Date(settings.date), // set target date
                current_date = currentDate(); // get fixed current date

            // difference of dates
            var difference = target_date - current_date;

            // if difference is negative than it"s pass the target date
            if (difference < 0) {
                // stop timer
                clearInterval(interval);

                if (callback && typeof callback === "function") callback();

                return;
            }

            // basic math variables
            var _second = 1000,
                _minute = _second * 60,
                _hour = _minute * 60,
                _day = _hour * 24;

            // calculate dates
            var days = Math.floor(difference / _day),
                hours = Math.floor((difference % _day) / _hour),
                minutes = Math.floor((difference % _hour) / _minute),
                seconds = Math.floor((difference % _minute) / _second);

                // fix dates so that it will show two digets
                days = (String(days).length >= 2) ? days : "0" + days;
                hours = (String(hours).length >= 2) ? hours : "0" + hours;
                minutes = (String(minutes).length >= 2) ? minutes : "0" + minutes;
                seconds = (String(seconds).length >= 2) ? seconds : "0" + seconds;

            // based on the date change the refrence wording
            var ref_days = (days === 1) ? "day" : "days",
                ref_hours = (hours === 1) ? "hour" : "hours",
                ref_minutes = (minutes === 1) ? "minute" : "minutes",
                ref_seconds = (seconds === 1) ? "second" : "seconds";

            // set to DOM
            container.find(".days").text(days);
            container.find(".hours").text(hours);
            container.find(".minutes").text(minutes);
            container.find(".seconds").text(seconds);

            container.find(".days_ref").text(ref_days);
            container.find(".hours_ref").text(ref_hours);
            container.find(".minutes_ref").text(ref_minutes);
            container.find(".seconds_ref").text(ref_seconds);
        };
        
        // start
        var interval = setInterval(countdown, 1000);
    };

})(jQuery);

main.js

$(function() {
  startOnePage({
    frame: "#view",
    container: "#frame",
    sections: ".panel",
    radio: "#radio",
    radioOn: "#radioOn",
    speed: 500,
    easing: "swing"
  });
});

main.css 樣式

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li{
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
    display: block;
}
body {
    line-height: 1;
    overflow-y: hidden;
}
ol, ul {
    list-style: none;
}

table {
    border-collapse: collapse;
    border-spacing: 0;
}

dt {
    font-size:2.3em;
}
dd {
    font-size:1.9em;
    padding:0.6em 0 0.9em 0;
}
.hidden {
    visibility: hidden;
}
.panel {
    width: 100%;
    height:100vh;
}

@-webkit-keyframes arrow {
    0%,100% {
        top:50px;
    }
    50% {
        top:80px;
    }
}
@keyframes arrow {
    0%,100% {
        top:50px;
    }
    50% {
        top:80px;
    }
}

/*側邊欄*/
#radioWrap{
    width:8px;
    position:absolute;
    right:8px;
    bottom:80px;
}

#radio{width:100%; height:100%; overflow: hidden;}

#radio li{
    width:8px;
    height:8px;
    background-color: rgba(255,255,255, 0.5);
    text-indent: -10000px;
    border-radius: 50%;
    margin-top: 12px;
    cursor:pointer;
    outline: none;
}
#radio li:first-child{margin-top:0;}

#radioOn{
    width:8px;
    height:8px;
    margin-bottom:12px;
    position: absolute;
    top:0; left:0;
    background-color: #ffd403;
    border-radius: 50%;
}

/*倒計時*/
ul.countdown {
    width: 70.2%;
    /*width: 484px;*/
    height: 44px;
    line-height: 44px;
    position: fixed;
    top:0;
    left: 0;
    /*right: 381px;*/
    display: block;
    text-align: center;
    background: rgba(255,255,255,0.8);
    font-weight: 300;
}

ul.countdown li {
    display: inline-block;
}

ul.countdown li span {
    font-size: 30px;
    color: #ff0000;
}
.seperator {
    font-size: 24px;
}


/*下拉箭頭*/
.goBottom{
    position: fixed;
    bottom: 5px;
    left: 0;
    right:0;
    margin: auto;
    z-index: 9999;
    text-align: center;
}
.goBottom>img{
    width: 60px;
    height: 60px;
    margin-bottom: 4px;
    display: inline-block;
}
.goBottomText{
    font-size: 14px;
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0px;
    font-size: 14px;
}

最終效果