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<script language="javascript">
function check(){
var dt1 = document.forms[0].d1.value;
var dt2 = document.forms[0].d2.value;
dt1 = new Date(dt1.replace(/-/g,"/"));
dt2 = new Date(dt2.replace(/-/g,"/"));
if(dt1.getFullYear()==dt2.getFullYear() && dt1.getMonth()==dt2.getMonth()) alert("同月");
else alert("不同月");
}
</script>
<form>
<input type="text" name="d1" value="2009-9-1">
<input type="text" name="d2" value="2009-9-11">
<input type="button" onclick="check()" value="CHECK">
</form>
<script language="javascript">
function check(){
var dt1 = document.forms[0].d1.value;
var dt2 = document.forms[0].d2.value;
dt1 = new Date(dt1.replace(/-/g,"/"));
dt2 = new Date(dt2.replace(/-/g,"/"));
if(dt1.getMonth()==dt2.getMonth()) alert("同月");
else alert("不同月");
}
</script>
<form>
<input type="text" name="d1" value="2009-9-1">
<input type="text" name="d2" value="2009-9-11">
<input type="button" onclick="check()" value="CHECK">
</form>