扩展jQuery实现日期联动
<html>
<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript" src="b.js"></script>
<body>
<div id="birthday_container">
<span style="white-space:pre"> </span><select name="year"></select>
<span style="white-space:pre"> </span><select name="month"></select>
<span style="white-space:pre"> </span><select name="day"></select>
</div>
</body>
</html>
<script type="text/javascript">
$("#birthday_container").birthday();
</script>
;(function($){
$.fn.birthday = function(options){
var opts = $.extend({}, $.fn.birthday.defaults, options);//整合参数
var $year = $(this).children("select[name="+ opts.year +"]");
var $month = $(this).children("select[name="+ opts.month +"]");
var $day = $(this).children("select[name="+ opts.day +"]");
MonHead = [31,28,31,30,31,30,31,31,30,31,30,31];
return this.each(function(){
var y = new Date().getFullYear();
var con = "";
//添加年份
for(i = y; i >= (y-80); i--){
con += "<option value='"+i+"'>"+i+"年"+"</option>";
}
$year.append(con);
con = "";
//添加月份
for(i = 1;i <= 12; i++){
con += "<option value='"+i+"'>"+i+"月"+"</option>";
}
$month.append(con);
con = "";
//添加日期
var n = MonHead[0];//默认显示第一月
for(i = 1; i <= n; i++){
con += "<option value='"+i+"'>"+i+"日"+"</option>";
}
$day.append(con);
$.fn.birthday.change($(this));
});
};
$.fn.birthday.change = function(obj){
obj.children("select[name="+ $.fn.birthday.defaults.year +"],select[name="+ $.fn.birthday.defaults.month +"]").change(function(){
var $year = obj.children("select[name="+ $.fn.birthday.defaults.year +"]");
var $month = obj.children("select[name="+ $.fn.birthday.defaults.month +"]");
var $day = obj.children("select[name="+ $.fn.birthday.defaults.day +"]");
$day.empty();
var selectedYear = $year.find("option:selected").val();
var selectedMonth = $month.find("option:selected").val();
if(selectedMonth == 2 && $.fn.birthday.IsRunYear(selectedYear)){//如果是闰年
var c ="";
for(var i = 1; i <= 29; i++){
c += "<option value='"+i+"'>"+i+"日"+"</option>";
}
$day.append(c);
}else {//如果不是闰年也没选2月份
var c = "";
for(var i = 1; i <= MonHead[selectedMonth-1]; i++){
c += "<option value='"+i+"'>"+i+"日"+"</option>";
}
$day.append(c);
}
});
};
$.fn.birthday.IsRunYear = function(selectedYear){
return(0 == selectedYear % 4 && (selectedYear%100 != 0 || selectedYear % 400 == 0));
};
$.fn.birthday.defaults = {
year:"year",
month:"month",
day:"day"
};
})(jQuery);
参考资料：http://www.tuicool.com/articles/MR7jqmA