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<HTML>
<HEAD>
<TITLE>新用户注册</TITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<link href="images/style.css" type=text/css rel=stylesheet></link>
<script language="javascript" src="script/registercheck.js"></script>
</HEAD>
<BODY>
<form name="form" action="userRegist.do" method="post" ">
<input type="text" maxLength="20" name="username" onblur="checkUserName(this.value.toLowerCase())">
</BODY>
</HTML>
function checkUserName(ssn) {
if(ssn.length<3 ||ssn.length>20) {
//alert("\请输入正确的用户名,用户名长度为3-18位!");
document.getElementById("usernameErr").innerHTML = "<font color='red'>请输入正确的用户名,用户名长度为3-18位!</font>";
form.username.focus();
return false;
}
if(isWhiteWpace(ssn)) {
alert("\请输入正确的用户名,用户名中不能包含空格!");
form.username.focus();
return false;
}
if(!isSsnString(ssn)) {
alert("\对不起,你选择的用户名不正确,或者已被占用!");
form.username.focus();
return false;
}
document.getElementById("usernameErr").innerHTML = "";
return true;
}
<input type="text" maxLength="20" name="username" onblur="checkUserName(this.value.toLowerCase())">
改为:
<input type="text" maxLength="20" id="username" onblur="checkUserName(this.value.toLowerCase())">
<span id="usernameErr"></span>
<HTML>
<HEAD>
<TITLE>新用户注册</TITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<link href="images/style.css" type=text/css rel=stylesheet></link>
<script language="javascript" src="script/registercheck.js"></script>
<script language="javascript">
<!--
function checkUserName(ssn) {
if(ssn.length<3 ||ssn.length>20) {
//alert("\请输入正确的用户名,用户名长度为3-18位!");
var obj=document.getElementById("usernameErr")
obj.style.display=""
obj.innerHTML = "<font color='red'>请输入正确的用户名,用户名长度为3-18位!</font>";
form.username.focus();
return false;
}
if(isWhiteWpace(ssn)) {
alert("\请输入正确的用户名,用户名中不能包含空格!");
form.username.focus();
return false;
}
if(!isSsnString(ssn)) {
alert("\对不起,你选择的用户名不正确,或者已被占用!");
form.username.focus();
return false;
}
document.getElementById("usernameErr").innerHTML = "";
return true;
}
//-->
</script>
</HEAD>
<BODY>
<form name="form" action="userRegist.do" method="post">
<input type="text" maxLength="20" name="username" onblur="checkUserName(this.value.toLowerCase())">
<span id="usernameErr" style="display:"></span>
</BODY>
</HTML>