注册时,在填写生日的时候,月份的天数会随着月份的改变而改变,这个小功能在很多的地方都用得到哦!
月份天数随月份改变
php代码
[php]
    //onchange事件
月
日 
    //onchange事件
月
日
js代码
[javascript]
function monthdays(month) 
{    
var xmlhttp; 
if (window.xmlhttprequest) 
  {// code for ie7+, firefox, chrome, opera, safari  
    xmlhttp=new xmlhttprequest(); 
  } 
else 
  {// code for ie6, ie5  
    xmlhttp=new activexobject(microsoft.xmlhttp); 
  } 
xmlhttp.onreadystatechange=function() 
  { 
  if (xmlhttp.readystate==4 && xmlhttp.status==200) 
    {  
    if(month==2) 
          { 
             document.getelementbyid(day).length=0;     //先把月份天数的select的option清空  
             for(i=1;i                { 
                   document.getelementbyid(day).options.add(new option(i,i)); 
                } 
      } 
        else if(month==4||month==6||month==9||month==11) 
               { 
                  document.getelementbyid(day).length=0; 
                  for(i=1;i                     { 
                        document.getelementbyid(day).options.add(new option(i,i)); 
                     } 
               } 
        else 
          { 
              document.getelementbyid(day).length=0; 
                  for(i=1;i                     { 
                        document.getelementbyid(day).options.add(new option(i,i)); 
                     } 
          }
} 
  }  
xmlhttp.open(get,index.php,true); 
xmlhttp.send(); 
} 
function monthdays(month)
{ 
var xmlhttp;
if (window.xmlhttprequest)
  {// code for ie7+, firefox, chrome, opera, safari
   xmlhttp=new xmlhttprequest();
  }
else
  {// code for ie6, ie5
   xmlhttp=new activexobject(microsoft.xmlhttp);
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readystate==4 && xmlhttp.status==200)
    {
 if(month==2)
          {
             document.getelementbyid(day).length=0;     //先把月份天数的select的option清空
             for(i=1;i                {
                   document.getelementbyid(day).options.add(new option(i,i));
                }
   }
        else if(month==4||month==6||month==9||month==11)
               {
            document.getelementbyid(day).length=0;
                  for(i=1;i                     {
                        document.getelementbyid(day).options.add(new option(i,i));
                     }
               }
        else
          {
              document.getelementbyid(day).length=0;
                  for(i=1;i                     {
                        document.getelementbyid(day).options.add(new option(i,i));
                     }
          }
}
  }
xmlhttp.open(get,index.php,true);
xmlhttp.send();
}
这种效果还是用到ajax的局部刷新技术，欢迎大家交流学习。（未完待续）
摘自 wyzhangchengjin123
http://www.bkjia.com/phpjc/478248.htmlwww.bkjia.comtruehttp://www.bkjia.com/phpjc/478248.htmltecharticle注册时,在填写生日的时候,月份的天数会随着月份的改变而改变,这个小功能在很多的地方都用得到哦! 5月份天数随月份改变 php代码 [php] s...