<input type="text" id="jiaxueq" name="jiaxueq">
<button onclick="f();">验证</button>
<script language="javascript">
function f(){
var jiaxueq = document.getElementById("jiaxueq");
if (/^\w+$/.test(jiaxueq.value)){
alert("正确");
}else{
alert("错误")
}
}
</script>
<button onclick="f();">验证</button>
<script language="javascript">
function f(){
var jiaxueq = document.getElementById("jiaxueq");
if (/^\w+$/.test(jiaxueq.value)){
alert("正确");
}else{
alert("错误")
}
}
</script>
<script language="JavaScript" type="text/javascript" >
function test()
{
var reg = /^\w+$/;
var val = document.getElementById("itext").value;
if(val!="")
{
alert(reg.test(val));
}
}
</script>
try{
usernameObj = document.loginform.username;
username_re=/(\d|[a-z]|_)+/;
if(! username_re.test(usernameObj.value)){
alert("用户名格式不正确!");
usernameObj.focus();
return false;
}
}catch(exception){
alert("Make sure the object id is correct!");
return false;
}
return true;
}
<script language="JavaScript" type="text/javascript" >
function test()
{
var reg = /^\w+$/;
var val = document.getElementById("itext").value;
if(val!="")
{
alert(reg.test(val));
}
}
</script>