此JavaScript检查是否姓名和年龄的形式包含有效的字符

<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
function validate(){
var digits="0123456789"
var temp
if (document.testform.Name.value=="") {
alert("No Name !")
return false
}
if (document.testform.age.value=="") {
alert("Invalid Age !")
return false
}
for (var i=0;i<document.testform.age.value.length;i++){
temp=document.testform.age.value.substring(i,i+1)
if (digits.indexOf(temp)==-1){
alert("Invalid Age !")
return false
      }
   }
return true
}
// End -->
</SCRIPT>

<FORM name="testform" onSubmit="return validate()">
Name:<input type="text" size=30 name="Name">
Age:<input type="text" size=3 name="age">
<input type="submit" value="Submit">
</FORM>