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  • 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><select id="yue" onclick="dianji()"></select><select id="tian"></select></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>
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  • 原文地址:https://www.cnblogs.com/AnswerTheQuestion/p/6099735.html
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