function makeYear() { 
  var year = document.getElementById("year"); 
  var my = new Date(); 
  var endYear = my.getFullYear();// 获取当前年份 
  for (var i = 1900; i <= endYear; i++) { 
    year.options.add(new Option(i, i + '年')); 
  } 
} 

function makeMonth() { 
  var month = document.getElementById("month"); 
  for (var i = 1; i <= 12; i++) { 
    /* 
     * if (i < 10) { 
        option.values='0'+i; 
        option.innerText='0'+i; 
     *  } else 
     *  { 
     *   option.values=i; 
     *   option.innerText=i; 
     * } 
     * month.appendChiled(option); 
     * 
     */ 
    if (i < 10) { 
      month.options.add(new Option('0' + i, '0' + i)); 
    } else { 
      month.options.add(new Option(i, i)); 
    } 
  } 
}