分开写?
switch (trade_type){
case (3):
alert('1');
break;
case (1):
alert('1');
break; case 2:
alert('2');
break;
case 4:
alert('4');
break; }
switch (trade_type){
case (3):
alert('1');
break;
case (1):
alert('1');
break; case 2:
alert('2');
break;
case 4:
alert('4');
break; }
for(var i=1;i<5;i++){
switch (i){
case (1):
case (3):
alert('1');
break;
case 2:
alert('2');
break;
case 4:
alert('4');
break; }
}
case 1:
case 3:
alert('1');
break; case 2:
alert('2');
break;
case 4:
alert('4');
break; }
<html>
<head></head>
<body>
<script language="javascript">
function t()
{
var ab = document.all.a.value;
var tmp = parseInt(ab);
switch (tmp){
case 1:
case 3:
alert(1);
break;
case 2:
alert(2);
break;
case 4:
alert(4);
break;
default:
alert(aa);
} }
</script>
<input type="text" name="a" value="1" onBlur="t()"></input>
</body>
</html>