js简单的年月联动实现代码

复制代码 代码如下:

<SELECT NAME="SelTjYear">
</SELECT>
<SELECT NAME="SelTjMonth">
</SELECT>

复制代码 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;
}
}
};
}

复制代码 代码如下:

vYearMonth('SelTjYear', 'SelTjMonth');

<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>
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