js 根据日期做星座联动，简洁

    $('#constellation').mousedown(function(){
      var constellations = new Array();

    /*  
     因本人数据库存的数据是数字，
     所以我需要返回星座来找到对应的数字，
     可根据实际情况改变
    */

      constellations['白羊座'] = "1";
      constellations['金牛座'] = "2";
      constellations['双子座'] = "3";
      constellations['巨蟹座'] = "4";
      constellations['狮子座'] = "5";
      constellations['处女座'] = "6";
      constellations['天秤座'] = "7";
      constellations['天蝎座'] = "8";
      constellations['射手座'] = "9";
      constellations['摩羯座'] = "10";
      constellations['水瓶座'] = "11";
      constellations['双鱼座'] = "12";

      var birth = $('#dateBirth').val();
      if(birth !==''){
         var m = birth.substr(5,2);
         var d = birth.substr(8,2);
         var consname = getAstro(m,d)+'座';
         $("#constellation").html('<option value="'+constellations[consname]+'">'+consname+'</option>');

      }

   })

   
});
function getAstro(m,d){

   return "魔羯水瓶双鱼白羊金牛双子巨蟹狮子处女天秤天蝎射手魔羯".substr(m*2-(d<"102123444543".charAt(m-1)- -19)*2,2);
// return m-(d<"102223444433".charAt(m-1)- -19);
}