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js年月日三级联动

2016-03-16 09:06 519 查看

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>三级联动-年月日</title>
<script type="text/javascript" src="getDates.js">
</script>
</head>
<body>
<select name="year" onchange="initDate()">
<script type="text/javascript">
<!--在 FF等浏览器内getYear()返回的是 "当前年份-1900" 的值-->
var year=new Date().getFullYear();
for(var i = year - 30;i <= year + 30; i++){
document.write("<option value=" + i + ">" + i + "</option>");
}
</script>
</select>
<select name="month" onchange="initDate()">
<script type="text/javascript">
for(var i = 1; i <= 12; i++){
document.write("<option value=" + i + ">" + i + "</option>");
}
</script>
</select>
<select name="day">
<script type="text/javascript">
for(var i = 1; i <= 31; i++){
document.write("<option value=" + i + ">" + i + "</option>");
}
</script>
</select>
</body>
<script type="text/javascript">
function  append(o,v){  
    var option=new Option(v,v);  
    o.options.add(option);  
}  
function  initDate(){   
    var y = document.getElementsByName("year")[0].value;  
    var m = document.getElementsByName("month")[0].value;   
    var day=document.getElementsByName("day")[0];  
    day.innerHTML="";  
         
    if(m==1 || m==3 || m==5 || m==7 || m==8 || m==10 || m==12){  
        for(var j = 1; j <= 31; j++){  
            append(day,j);  
        }  
    }  
    else if(m==4 || m==6 || m==9 || m==11){  
        for(var j = 1; j <= 30; j++){  
            append(day,j);  
        }  
    }  
    else if(m == 2){  
        var flag = (y % 4 == 0)&& (y % 100 != 0) || (y % 400 == 0);  
        if(flag){  
            for(var j = 1; j <= 29; j++){  
                 append(day,j);  
            }  
        }  
        else{  
            for(var j = 1;j <= 28; j++){  
                append(day,j);  
            }  
        }  
    }  
}  
</script>
</html>

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