<script language='javascript'> function check(value){ if(isNaN(value)){return true;} } </script>
<script language="javascript"> <!-- function isNumber(ch) {return ((ch>="0")&&(ch<="9")) } //注意:yourvalue是一个字串 function isAllNumber(yourvalue) { var c,i; var str = yourvalue; for (i = 0 ; i < str.length ; i++) { c = str.charAt(i); if (!isNumber(c)) return false; } return true; }
function check(value){
if(isNaN(value)){return true;}
}
</script>
<!--
function isNumber(ch)
{return ((ch>="0")&&(ch<="9")) }
//注意:yourvalue是一个字串
function isAllNumber(yourvalue)
{ var c,i;
var str = yourvalue;
for (i = 0 ; i < str.length ; i++)
{ c = str.charAt(i);
if (!isNumber(c))
return false;
}
return true;
}
//-->
</script>
<script>
alert(!isNaN("5e5"));//true,是个合理的数值
alert(!isNaN("3.14"))
</script>
判断全为数字可以用正则
<script>
alert(!/\D/g.test("5e5"))
</script>