此JavaScript检查是否姓名和年龄的形式包含有效的字符
<SCRIPT LANGUAGE="JavaScript"><!– Beginfunction validate(){var digits="0123456789"var tempif (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>
世上最累人的事，莫过於虚伪的过日子
