js简单的年月联动实现代码

<SELECT NAME="SelTjYear"> 
</SELECT> 
<SELECT NAME="SelTjMonth"> 
</SELECT> 
 
源码： 
 代码如下:

function vYearMonth(yearObjId, monthObjId) { 
var selYear = document.getElementById(yearObjId); 
var selMonth = document.getElementById(monthObjId); 
var myDate = new Date(); //当前日期 
var myYear = myDate.getFullYear(); //当前年 
var myMonth = myDate.getMonth() + 1; //当前月 
var yearMin = -2; //年份范围值，也当前年比较的差值 
var yearMax = 10; //年份范围值，也当前年比较的差值 

//Begin年******************************* 
selYear.options.add(new Option("", "")); 
for (var i = yearMin; i < yearMax; i++) { 
var opt = new Option(myYear + i, myYear + i); 
selYear.options.add(opt); 
} 
//这里1-yearMin表示选中当前年，用1是因为开头有插入"" 
selYear.options.selectedIndex = 1 - yearMin; 
//End年******************************* 

//Begin月******************************* 
selMonth.options.add(new Option("", "")); 
for (var i = 0; i < 12; i++) { 
var opt = new Option(i + 1, i + 1); 
selMonth.options.add(opt); 
} 
//选中当前月 
selMonth.options.selectedIndex = myMonth; 
//End月******************************* 


selYear.onchange = function () { 
if (this.value == "") { 
selMonth.selectedIndex = 0; 
} 
else { 
if (selMonth.value == "") { 
selMonth.selectedIndex = myMonth; 
} 
} 
}; 
} 
 
调用： 
 代码如下:

vYearMonth('SelTjYear', 'SelTjMonth'); 
 
完整的演示代码: 
 
<SELECT NAME="SelTjYear"> 
</SELECT> 
<SELECT NAME="SelTjMonth"> 
</SELECT> 
<script> 
function vYearMonth(yearObjId, monthObjId) { 
var selYear = document.getElementById(yearObjId); 
var selMonth = document.getElementById(monthObjId); 
var myDate = new Date(); //当前日期 
var myYear = myDate.getFullYear(); //当前年 
var myMonth = myDate.getMonth() + 1; //当前月 
var yearMin = -2; //年份范围值，也当前年比较的差值 
var yearMax = 10; //年份范围值，也当前年比较的差值 

//Begin年******************************* 
selYear.options.add(new Option("", "")); 
for (var i = yearMin; i < yearMax; i++) { 
var opt = new Option(myYear + i, myYear + i); 
selYear.options.add(opt); 
} 
//这里1-yearMin表示选中当前年，用1是因为开头有插入"" 
selYear.options.selectedIndex = 1 - yearMin; 
//End年******************************* 

//Begin月******************************* 
selMonth.options.add(new Option("", "")); 
for (var i = 0; i < 12; i++) { 
var opt = new Option(i + 1, i + 1); 
selMonth.options.add(opt); 
} 
//选中当前月 
selMonth.options.selectedIndex = myMonth; 
//End月******************************* 


selYear.onchange = function () { 
if (this.value == "") { 
selMonth.selectedIndex = 0; 
} 
else { 
if (selMonth.value == "") { 
selMonth.selectedIndex = myMonth; 
} 
} 
}; 
} 
vYearMonth('SelTjYear', 'SelTjMonth'); 
</script> 

  [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]