select.js
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$.fn.selectDate = function(){
var minYear = 1900
var maxYear = (new Date).getFullYear()
var yearSel = document.getElementById('year')
var monthSel = document.getElementById('month')
var daySel = document.getElementById('days')
for(var y = maxYear;y >= minYear;y--){
var yearOpt = document.createElement('option')
yearOpt.value = y
yearOpt.innerHTML = y+'年'
yearSel.appendChild(yearOpt)
}
$("#year").click(function(event){
if(!$("#year option:selected").val()) return;
removeOption(monthSel)
addOption(12,'月',monthSel)
removeOption(daySel)
})
$("#month").click(function(){
removeOption(daySel)
var year = $("#year option:selected").val()
var month = $("#month option:selected").val()
if(month==1 || month==3 || month==5 || month==7 || month==8 || month==10 || month==12){
addOption(31,'日',daySel)
}else if(month==4 || month==6 || month==9 || month==11){
addOption(30,'日',daySel)
}else if(month==2){
if((year%4 == 0 && year%100 != 0 ) || (year%400 == 0)){
addOption(29,'日',daySel)
}else{
addOption(28,'日',daySel)
}
}
})
function addOption(num,unit,parent){
//num：选项个数
//unit：单位（年/月/日）
//parent：父对象
for(var index=1;index <= num;index++){
var opt =document.createElement('option')
$(opt).attr('value',index)
if(index<10){index = '0'+index}
$(opt).html(index+unit)
$(parent).append(opt)
}
}
function removeOption(parent){
//parent：父对象
var options = $(parent).find('option')
for(var index = 1;index < options.length;index++){
parent.removeChild(options[index])
}
}
}