<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
function check() {
//教研名字
var firstnamev = document.getElementById('firstname').value;
if (firstnamev == '') {
alert('名字不能为空');
return false;
} else {
for (var i = 0; i < firstnamev.length; i++) {
var c = firstnamev[i];
if (c >= 0) {
alert('名字不能包含数字');
return false;
}
}
}
//教研姓氏
var lastnamev = document.getElementById('lastname').value;
if (lastnamev == '') {
alert('姓氏不能为空');
return false;
} else {
for (var j = 0; j < lastnamev.length; j++) {
var cl = lastnamev[j];
if (cl >= 0) {
alert('姓氏不能包含数字');
return false;
}
}
}
//校验邮箱
var emailv = document.getElementById('email').value;
if (emailv == '') {
alert('邮箱不能为空！');
return false;
} else {
var index1 = emailv.indexOf('@');//字符串中包含“@”
var index2 = emailv.indexOf('.');//字符串中包含“.”
if (index1 == -1 || index2 == -1) {//@,.不存在
alert('邮箱地址不合法！');
return false;
} else if (index1 >= index2) {//@在.的后面,索引大于.
alert('邮箱地址不合法！');
return false;
}
}
//校验密码
var p = document.getElementById('password').value;
if (p == '') {
alert('密码不能为空!');
return false
} else if (p.length <= 3) {
alert('密码长度小于6!');
return false;
}
var chekpsdv = document.getElementById('check_password').value;
if (chekpsdv == '') {
alert('请再次输入密码');
return false;
}
else if (chekpsdv != p) {
alert('两次输入密码不一致');
return false;
}
}
</script>
</head>
<body>
<form action="do.html" onsubmit="return check();">
名字：<input type="text" id="firstname"><br>
姓氏：<input type="text" id="lastname"><br>
邮箱：<input type="text" name="" id="email"><br>
密码：<input type="txt" name="" id="password"><br>
再次输入密码：<input type="txt" name="" id="check_password"><br>
<input type="submit" value="提交">
</form>
</body>
</html>
