js函数——倒计时模块+无缝滚动

倒计时

效果:

代码:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>倒计时函数</title>
    <script>
    var timer=(function(){
        return function (json){
            if(json.currentTime){
                var now=new Date();
                var year=now.getFullYear();//返回年份(4位数字)
                var month=now.getMonth()+1;//返回月份(0-11,所以+1)
                var day=now.getDate();//返回某天(1-31)
                var h=now.getHours();//返回小时(0-23)
                var m=now.getMinutes();//返回分钟(0-59)
                var s=now.getSeconds();//返回秒数(0-59)
                //补O
                m=m<10?'0'+m:m;
                s=s<10?'0'+s:s;
                var weekday=['星期日','星期一','星期二','星期三','星期四','星期五','星期六'];
                document.getElementById(json.objId).innerHTML=year+''+month+''+day+''+weekday[now.getDay()]+'   '+h+':'+m+':'+s;
                setTimeout(function(){timer(json)},1000);
            }else{
                var endtime=new Date(json.endtime);//结束时间
                var nowtime = new Date();//当前时间
                var lefttime=parseInt((endtime.getTime()-nowtime.getTime())/1000); //计算差的秒数
                //一天24小时  一小时60分钟  一分钟60秒
                d=parseInt(lefttime/3600/24);
                h=parseInt((lefttime/3600)%24);
                m=parseInt((lefttime/60)%60);
                s=parseInt(lefttime%60);
                document.getElementById(json.objId).innerHTML=d+""+h+"小时"+m+""+s+"";
                if(lefttime>0){setTimeout(function(){timer(json)},1000);}
            }
        }
    })()
        
        window.onload=function(){
            timer({
                currentTime:true,
                objId:'thisTime'
            })
            timer({
                objId:'countDown',
                endtime:"2016/9/1,18:00"
            })
        }
    </script>
</head>
<body>
    <b>当前时间:</b> <span id="thisTime"></span><br/><br/>
    <b>距离2016/9/1 18:00还有:</b> <span id="countDown"></span>
</body>
</html>

注意点:

1.有两个功能:当前时间和倒计时,带的参数不同

2.主要是利用js返回的数据,要注意月份,某天,小时,分钟,返回的数值区间

3.星期的我这边用数组处理了

4.倒计时主要是计算时间差,结束时间减去当前时间的秒数,在进行数学计算

5.这里用了闭包,防止多个定时器冲突

6.这边的代码比较易懂,牛人可以改造成插件,还望分享分享。嘿嘿

间歇滚动+无缝滚动

效果(用gif录制的效果不是很好,有兴趣的可以down代码)

代码:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>无缝滚动</title>
    <style>
        *{margin:0;padding:0;}
        .box{width: 500px;height: 400px;margin:40px auto;background: #ccc;overflow: hidden;}
        .block{position: relative;width: 500px;height: 400px;overflow: hidden;}
        .item{height: 40px;background: red;color: #fff;line-height: 40px;text-align: center;}
        .item:nth-child(2n){background: #000}
    </style>
    <script>
        var scrollUp=(function(){
            return function(json){
                var objScroll = document.getElementById(json.id);
                objScroll.scrollTop = 0;
                objScroll.innerHTML += objScroll.innerHTML;
                if(json.on){
                    function scrollIng(){
                        if(objScroll.scrollTop >= objScroll.scrollHeight) {
                            objScroll.scrollTop = 0;
                        }else{
                            objScroll.scrollTop ++; 
                        } 
                    }
                    var myScroll = setInterval(function(){scrollIng()},30);
                    objScroll.onmouseover = function(){
                        clearInterval(myScroll);
                    }
                    objScroll.onmouseout = function(){
                        myScroll = setInterval(function(){scrollIng()},30);
                    }
                }else{
                    var timer;
                    function startScroll(){
                        timer=setInterval(function(){scrollUp()},30);
                        objScroll.scrollTop++;
                    }
                    function scrollUp(){
                        if(objScroll.scrollTop % json.height==0){
                            clearInterval(timer);
                            setTimeout(startScroll,2000);
                        }else{
                            objScroll.scrollTop++;
                            if(objScroll.scrollTop >= objScroll.scrollHeight/2){
                                objScroll.scrollTop =0;
                            }
                        }
                    }
                    setTimeout(startScroll,1000);
                }
            }
        })()
        window.onload=function(){
            //on:间歇滚动/无缝滚动  height:间歇滚动的高度
            scrollUp({on:true,id:'block'});
            scrollUp({id:'block2',height:120});
        }
        
    </script>
</head>
<body>
    <div class="box">
        <div class="block" id="block">
            <div class="item">1无缝滚动</div>
            <div class="item">2无缝滚动</div>
            <div class="item">3无缝滚动</div>
            <div class="item">4无缝滚动</div>
            <div class="item">5无缝滚动</div>
            <div class="item">6无缝滚动</div>
            <div class="item">7无缝滚动</div>
            <div class="item">8无缝滚动</div>
            <div class="item">9无缝滚动</div>
            <div class="item">10无缝滚动</div>
            <div class="item">11无缝滚动</div>
            <div class="item">12无缝滚动</div>
            <div class="item">13无缝滚动</div>
            <div class="item">14无缝滚动</div>
            <div class="item">15无缝滚动</div>
        </div>
    </div>
    <div class="box">
        <div class="block" id="block2">
            <div class="item">1间歇滚动</div>
            <div class="item">2间歇滚动</div>
            <div class="item">3间歇滚动</div>
            <div class="item">4间歇滚动</div>
            <div class="item">5间歇滚动</div>
            <div class="item">6间歇滚动</div>
            <div class="item">7间歇滚动</div>
            <div class="item">8间歇滚动</div>
            <div class="item">9间歇滚动</div>
            <div class="item">10间歇滚动</div>
            <div class="item">11间歇滚动</div>
            <div class="item">12间歇滚动</div>
            <div class="item">13间歇滚动</div>
            <div class="item">14间歇滚动</div>
            <div class="item">15间歇滚动</div>
        </div>
    </div>
</body>
</html>

注意点:

1.盒子块要css 溢出隐藏:overflow:hidden

2.有两个功能:间歇滚动/无缝滚动

3.先复制一块一模一样的代码,无缝滚动:执行定时器一直增加scrollTop值,当scrollTop值大于盒子高度,在设置scrollTop为0,重新来过。间歇滚动在此基础上加了setTimeout,间歇执行,在scrollTop到达指定的height停止

4.疑问:代码中setInterval(function(){scrollIng()},30);这样写才可以执行,setInterval('scrollIng()',30);这样就不行,有没有大神指导下,两者有啥区别?是啥机制?

 

posted @ 2016-06-29 11:21  羯瑞  阅读(2163)  评论(6编辑  收藏  举报