<script type="text/javascript">
function dayChange(year,month,day){
var selectYear = document.getElementById(year);
var selectMonth = document.getElementById(month);
var selectDay = document.getElementById(day);
var y = selectYear.value,m = selectMonth.value,d = selectDay.value;
if(m==4||m==6||m==9||m==11){
if(selectDay.length == 31){
selectDay.options.remove(30);
}
if(selectDay.length == 29){
selectDay.options.add(30,30);
}
if(selectDay.length == 28){
selectDay.options.add(29,29);
selectDay.options.add(30,30);
}
}
if(m==1||m==3||m==5||m==7||m==8||m==10||m==12){
if(selectDay.length == 30){
selectDay.options.add(new Option(31,31));
}
if(selectDay.length == 29){
selectDay.options.add(new Option(30,30));
selectDay.options.add(new Option(31,31));
}
if(selectDay.length == 28){
selectDay.options.add(new Option(29,29));
selectDay.options.add(new Option(30,30));
selectDay.options.add(new Option(31,31));
}
}
if(m==2){
if(isRunYear(y)){
if(selectDay.length == 31){
selectDay.options.remove(30);
selectDay.options.remove(29);
}
if(selectDay.length == 30){
selectDay.options.remove(29);
}
if(sele
<script type="text/javascript">
window.onbeforeunload=function()
{
alert("onbeforeunload event...");
//return false;
}
</script>
<a href="#" onclick="return true;">测试1</a><br/>
<a href="javascript:void(0)" onclick="return true;">测试2</a><br/& ......
prototype 是在 IE 4 及其以后版本引入的一个针对于某一类的对象的方法，而且特殊的地方便在于：它是一个给类的对象添加方法的方法！这一点可能听起来会有点乱，别急，下面我便通过实例对这一特殊的方法作已下讲解：
首先，我们要先了解一下类的概念，JavaScript 本身是一种面向对象的语言，它所涉及的元素根据其属性� ......
