1<html>
2<head>
3<meta content="text/html; charset=utf-8" http-equiv="Content-Type"/>
4<meta content="Microsoft FrontPage 4.0" name="GENERATOR"/>
5<meta content="FrontPage.Editor.Document" name="ProgId"/>
6<title>New Page 1</title>
7</head>
8<body>
9<script language="javascript">
10//校验是否为英文
11function checkchar()
12{
13var Letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
14for (i=0; i < document.form.aaa.value.length; i++)
15{
16var CheckChar = document.form.aaa.value.charAt(i);
17CheckChar = CheckChar.toUpperCase();
18if (Letters.indexOf(CheckChar) == -1)
19{
20alert ("输入类型必须为英文！");
21return false;
22}
23}
24}
25
26//校验是否为数字
27
28function checknum(p)
29{
30if (p == "")
31{alert ("输入不能为空！");
32return false;
33}
34var l = p.length;
35var count=0;
36for(var i=0; i<l; i++)
37{
38var digit = p.charAt(i);
39if(digit == "." )
40{
41++count;
42if(count>1)
43{alert ("输入类型必须为数字！");
44return false;
45}
46}
47else if(digit < "0" || digit > "9")
48{alert ("输入类型必须为数字！");
49return false;
50}
51}
52return true;
53}
54
55//校验IP地址格式
56function checkip()
57{
58var scount=0;
59var ip = document.form3.ccc.value;
60var iplength = ip.length;
61var Letters = "1234567890.";
62for (i=0; i < document.form3.ccc.value.length; i++)
63{
64var CheckChar = document.form3.ccc.value.charAt(i);
65if (Letters.indexOf(CheckChar) == -1)
66{
67alert ("IP地址格式不对!!，只能输入数字和“.”,格式为XXX.XXX.XXX.XXX 例如：192.168.0.1");
68document.form3.ccc.value="";
69document.form3.ccc.focus();
70return false;
71}
72}
73
74for (var i = 0;i<iplength;i++)
75(ip.substr(i,1)==".")?scount++:scount;
76if(scount!=3)
77{
78alert ("IP地址格式不对!，只能输入数字和“.”,格式为XXX.XXX.XXX.XXX 例如：192.168.0.1");
79document.form3.ccc.value="";
80document.form3.ccc.focus();
81return false;
82}
83
84first = ip.indexOf(".");
85last = ip.lastIndexOf(".");
86str1 = ip.substring(0,first);
87subip = ip.substring(0,last);
88sublength = subip.length;
89second = subip.lastIndexOf(".");
90str2 = subip.substring(first+1,second);
91str3 = subip.substring(second+1,sublength);
92str4 = ip.substring(last+1,iplength);
93
94if (str1=="" || str2=="" ||str3== "" ||str4 == "")
95{alert("数字不能为空！格式为XXX.XXX.XXX.XXX 例如：192.168.0.1");
96document.form3.ccc.value="";
97document.form3.ccc.focus();
98return false;
99}
100if (str1< 0 || str1 >255)
101{alert ("数字范围为0~255！");
102document.form3.ccc.value="";
103document.form3.ccc.focus();
104return false;
105}
106else if (str2< 0 || str2 >255)
107{alert ("数字范围为0~255！");
108document.form3.ccc.value="";
109document.form3.ccc.focus();
110return false;
111}
112else if (str3< 0 || str3 >255)
113{alert ("数字范围为0~255！");
114document.form3.ccc.value="";
115document.form3.ccc.focus();
116return false;
117}
118else if (str4< 0 || str4 >255)
119{alert ("数字范围为0~255！");
120document.form3.ccc.value="";
121document.form3.ccc.focus();
122return false;
123}
124
125//校验电话号码
126function checkphone()
127{
128var Letters = "1234567890,";
129for (i=0; i < document.form4.ddd.value.length; i++)
130{
131var CheckChar = document.form4.ddd.value.charAt(i);
132if (Letters.indexOf(CheckChar) == -1)
133{
134alert ("电话号码只能为数字或逗号！");
135return false;
136}
137}
138}
139
140
141}
142
143
144
145</script>
146<form action="aa" method="POST" name="form" onsubmit="return checkchar()">
147<p>校验英语字母：<input name="aaa" size="20" type="text"/>
148</p>
149<p>
150<input name="B1" type="submit" value="提交"/>
151<input name="B2" type="reset" value="全部重写"/></p>
152</form>
153<form method="POST" name="form2" onsubmit="return checknum(document.form2.bbb.value)">
154<p>校验数字：<input name="bbb" size="20" type="text"/></p>
155<p><input name="B1" type="submit" value="提交"/><input name="B2" type="reset" value="全部重写"/></p>
156</form>
157<form method="POST" name="form3" onsubmit="return checkip()">
158<p>校验IP地址：<input name="ccc" size="20" type="text"/></p>
159<p><input name="B1" type="submit" value="提交"/><input name="B2" type="reset" value="全部重写"/></p>
160</form>
161<form method="POST" name="form4" onsubmit="return checkphone()">
162<p>校验电话号码：<input name="ddd" size="20" type="text"/><input name="B1" type="submit" value="提交"/><input name="B2" type="reset" value="全部重写"/></p>
163</form>
164</body>
165</html>
javascript做的数据校验（校验IP地址等）
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