问题，着急解决！

Question

<script>
var a=11
var b="11"
alert(typeof a)
alert(typeof b)
</script>

Answer 1

现成的
alert(!isNaN("33k"))
alert(!isNaN(33))

Answer 2

msgbox isnumeric("fdsfds")
msgbox isnumeric(11)

Answer 3

var rexp = /^(\d+(*|-|+|\/)\d+)+$/;
flag = rexp.test(s);

Answer 4

<script language=JavaScript>
try{alert(eval("3+4/5"))}catch(e){alert("error")}
try{alert(eval("3+*/4)5"))}catch(e){alert("error")}
</script>

Answer 5

var rexp = /^(\d+(*|-|+|\/)\d+)+$/;
flag = rexp.test(s);就是判断是否是合法的运算串啊