JS初学者必备的几个经典案例（二）！！！

一.写出当前年份的前后5年的日期表

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>无标题文档</title>

    <style type="text/css">

    </style>

</head>

<body>

    <select id="nian" onclick="dianji()"></select>年

    <select id="yue" onclick="dianji()"></select>月

    <select id="tian"></select>日

</body>

    <script type="text/javascript">

        nian();

        yue();

        tian();

        function nian()

        {

            var b = new Date();

            var nian=parseInt(b.getFullYear());

            var str="";

            for(i=nian-5;i<nian+6;i++)

            {

                str=str+"<option value='"+i+"'>"+i+"</option>";

                document.getElementById("nian").innerHTML=str;

            }

        }

        function yue()

        {

            var str="";

            for(i=1;i<13;i++)

            {

                str=str+"<option value='"+i+"'>"+i+"</option>";

                document.getElementById("yue").innerHTML=str;

            }

        }

        function tian()

        {

            var yue=document.getElementById("yue").value;

            var nian=document.getElementById("nian").value;

            var ts=31;

            if(yue==4 || yue==6 || yue==9 || yue==11)

            {

                ts=30;

            }    

            if(yue==2)

            {

                if((nian%4==0 && nian%100!=0) || nian%400==0)

                {

                    ts=29;

                }

                else

                {

                    ts=28;

                }

            }

                var str="";

                for(i=1;i<ts+1;i++)

                {

                    str=str+"<option value='"+i+"'>"+i+"</option>";

                    document.getElementById("tian").innerHTML=str;

                }

        }

            function dianji()

            {

                tian();

            }

    </script>

</html>

二.大图轮播

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>无标题文档</title>

<style type="text/css">

*{ margin:0px auto; padding:0px}

#wai{ width:250px; height:20px; position:relative; top:-30px;}

    .img{ width:100%; height:300px; display:none}

    .yuan{ width:20px; height:20px; background-color:#F00; border:2px solid #FFF; border-radius:100px; float:left; margin-left:30px; cursor:pointer}

</style>

</head>

<body>

    <br /><br />

    <img class="img" src="卓最闪的衫扮十分感慨有人拍照要记得插袋/pic/壁纸/fcfaaf51f3deb48fbcf9f4aef21f3a292df57829.jpg" style="display:block" />

     <img class="img" src="卓最闪的衫扮十分感慨有人拍照要记得插袋/pic/壁纸/。，ll.jpg" />

      <img class="img" src="卓最闪的衫扮十分感慨有人拍照要记得插袋/pic/壁纸/2cf5e0fe9925bc319ab5e0385edf8db1ca1370a2.jpg" />

       <img class="img" src="卓最闪的衫扮十分感慨有人拍照要记得插袋/pic/壁纸/4-14101G43447.jpg" />

<div id="wai">

    <div class="yuan" onclick="dian('0')" ></div>

    <div class="yuan" onclick="dian('1')" ></div>

    <div class="yuan" onclick="dian('2')" ></div>

    <div class="yuan" onclick="dian('3')" ></div>

</div>

</body>

<script type="text/javascript">

<!--定义索引默认为0-->

    var sy=0;

    <!--调方法-->

    window.setInterval("huan()",4000);

    function huan()

    {

        <!--大图自动轮播-->

        var img=document.getElementsByClassName("img");

        sy++;

        if(sy>=img.length)

        {

            sy=0;

        }

        for(i=0;i<img.length;i++)

        {

            img[i].style.display="none";

        }

            img[sy].style.display="block";

        <!--大图轮播的同时小点跟着换样式-->

        var yuan=document.getElementsByClassName("yuan");

        for(j=0;j<yuan.length;j++)

        {

            yuan[j].style.backgroundColor="red";

        }

            yuan[sy].style.backgroundColor="black";

    }

    function dian(s)

    {

        <!--让当前的索引sy变成你所点击的索引s。这样下一张图片就会挨着显示-->

        sy=s;

        <!--点击小点对应的图片显示-->

        var img=document.getElementsByClassName("img");

        for(i=0;i<img.length;i++)

        {

            img[i].style.display="none";

        }

            img[s].style.display="block";

        <!--点击小点，小点也对应的跟着换样式-->

        var yuan=document.getElementsByClassName("yuan");

        for(j=0;j<yuan.length;j++)

        {

            yuan[j].style.backgroundColor="red";

        }

            yuan[s].style.backgroundColor="black";

    }

</script>

</html>

巴特西

JS初学者必备的几个经典案例（二）！！！

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