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How can I get the last month and the next month in javascript ?

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Show ResultJAVASCRIPT

<!DOCTYPE html>
<html>
<head>

<script>

function test() {

var today = new Date();
var month1 = new Date(today.getTime() + (-720 * 60 * 60 * 1000));
var month2 = new Date(today.getTime() + (720 * 60 * 60 * 1000));

lastmonth = month1;
nextmonth = month2;

var a = lastmonth.getMonth();
var b = nextmonth.getMonth();

switch (a) {

case 0:
txt1 = "Jan";
break;
case 1:
txt1 = "Feb";
break;
case 2:
txt1 = "Mar";
break;
case 3:
txt1 = "Apr";
break;
case 4:
txt1 = "May";
break;
case 5:
txt1 = "June";
break;
case 6:
txt1 = "July";
break;
case 7:
txt1 = "Aug";
break;
case 8:
txt1 = "Sept";
break;
case 9:
txt1 = "Oct";
break;
case 10:
txt1 = "Nov";
break;
case 11:
txt1 = "Dec";
break;
}

alert("last month was " + txt1);

switch (b) {

case 0:
txt1 = "Jan";
break;
case 1:
txt1 = "Feb";
break;
case 2:
txt1 = "Mar";
break;
case 3:
txt1 = "Apr";
break;
case 4:
txt1 = "May";
break;
case 5:
txt1 = "June";
break;
case 6:
txt1 = "July";
break;
case 7:
txt1 = "Aug";
break;
case 8:
txt1 = "Sept";
break;
case 9:
txt1 = "Oct";
break;
case 10:
txt1 = "Nov";
break;
case 11:
txt1 = "Dec";
break;
}

alert("next month is " + txt1);

}

</script>

</head>
<body>

<button onclick="test()">click</button>

</body>
</html>