验证数量和金额
通过isNaN()方法验证，返回一个Boolean值
验证数量的正则表达式为：
var regExp2 = /^[1-9]+(\d*)$/;
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>验证数量和金额</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script language="javascript">
function checkInsert(){
var number = document.getElementById("number"); //数量文本框对象
var price = document.getElementById("price"); //单价文本框对象
var regExp2 = /^[1-9]+(\d*)$/; //验证数量的正则表达式
if(isNaN(price.value)){ //验证单价是否为数字
alert("您输入的单价不是有效值！");
price.focus();
return false;
}
if(number.value!=null&&number.value!=""){
if(!regExp2.test(number.value)){ //验证数量是否符合正则表达式
alert("数量必须为正整数！");
number.focus();
return false;
}
}
return true;
}
function save(){
if(checkInsert()){
document.getElementById("myform").submit();
}
}
</script>
<style type="text/css">
table{
font-size: 13px;
font-family: 楷体;
color:navy;
}
input{
font-size: 13px;
font-family: 楷体;
color:navy;
}
font{
font-size: 12px;
font-family: 楷体;
color:orangered;
}
.style1{
width: 500px;
height: 260px;
}
</style>
</head>
<body>
<fieldset class="style1"><legend>添加采购信息</legend>
<form action="" id="myform">
<table align="center">
<tr>
<td>采购单号：</td>
<td>
<input type="text" >
</td>
</tr>
<tr>
<td>商品名称：</td>
<td>
<input type="text" />
</td>
</tr>
<tr>
<td>生产厂家：</td>
<td>
<input type="text" />
</td>
</tr>
<tr>
<td>规格：</td>
<td>
<input type="text" >
</td>
</tr>
<tr>
<td>单价：</td>
<td>
<input type="text" id="price"/>元
</td>
</tr>
<tr>
<td>数量：</td>
<td>
<input type="text" id="number"/>
</td>
</tr>
<tr>
<td align="center" colspan="2">
<input type="button" value="保 存" "save()">
</td>
</tr>
</table>
</form>
</fieldset>
</body>
</html>