JAVASCRIPT正则表达式简单实现文本框验证

return false;

}

flag_p=pattern.test(document.loginform.password.value);

if(!flag_p||document.loginform.password.value.length<4||document.loginform.password.value.length>16)

{

alert("用户密码输入非法!");

document.loginform.password.focus();

return false;

}

}

-->

</script>

<form name="loginform" onsubmit="return c_check()">

<INPUT TYPE="text" NAME="username">

<INPUT TYPE="text" NAME="password">

<INPUT TYPE="submit">

</form>

</BODY>

</HTML>