JS中使用new Option()实现时间联动效果

//1.动态创建select
function createSelect(){
  var mySelect = document.createElement("select");
  mySelect.id = "mySelect"; 
  document.body.appendChild(mySelect);
}
//2.添加选项option
function addOption(){
  //根据id查找对象，
  var obj=document.getElementById('mySelect');
  //添加一个选项
  obj.add(new Option("文本","值"));  //方法一：
  obj.options.add(new Option("text","value")); //方法二：
  for(var i=0;i<10;i++){
    obj.options[i]=new Option("新文本","新值");  //方法三：
  }
}
//3.删除所有选项option
function removeAll(){
  var obj=document.getElementById('mySelect');
  obj.options.length=0;
}
//4.删除一个选项option
function removeOne(){
  var obj=document.getElementById('mySelect');
  var index=obj.selectedIndex;  //index,要删除选项的序号
  obj.options.remove(index);
}
//5.获得选项option的值
var obj=document.getElementById('mySelect');
var index=obj.selectedIndex;   //序号，取当前选中选项的序号
var val = obj.options[index].value;
//6.获得选项option的文本
var obj=document.getElementById('mySelect');
var index=obj.selectedIndex;  
var val = obj.options[index].text;
//7.修改选项option
var obj=document.getElementById('mySelect');
var index=obj.selectedIndex;  
var val = obj.options[index]=new Option("新文本","新值");
//8.删除select
function removeSelect(){
  var mySelect = document.getElementById("mySelect");
  mySelect.parentNode.removeChild(mySelect);
}

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
  <title>日期和年份月份联动demo</title>
</head>
<body>
  <select id="year">
    <option value="">请选择年份</option>
  </select>
  <select id="month">
    <option value="">请选择月份</option>
  </select>
  <select id="day">
    <option value="">请选择日期</option>
  </select>
  <script>
    var year = document.getElementById("year");
    var month = document.getElementById("month");
    var day = document.getElementById("day");
    var y = new Date().getFullYear();
    //前后均有
    for (i = (y - 30); i < (y + 30); i++) {
      year.options.add(new Option(i + "年", i));
      //格式不要写错，不要写成add(new Option(i + "年"), i)。
    }
    //只写前或者后
    // for(var i=y;i>1977;i--){
    //   year.options[y+1-i]=new Option(i+"年",i);//索引是options[],增加是new option(text,value)
    // }
    for (i = 1; i < 13; i++) {
      month.options.add(new Option(i + "月", i));
    }
    var d = function () {
      day.length = 1; //初始化
      if (year.value == " " || month.value == " ") {
        return;
      } else {
        var Days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
        if ((year.value % 4 == 0 && year.value % 100 != 0) || year.value % 400 == 0) {
          Days[1]++; //判断为闰年，二月天数加一
        }
        for (i = 1; i <= Days[month.value - 1]; i++) {
          day.options.add(new Option((i + "日"), i));
        }
      }
    }
    //刷新日期天数
    year.onchange = function () {
      d();
    }
    month.onchange = function () {
      d();
    }
  </script>
</body>
</html>