<form>
登陆名称:<br>
<input type="text" name="loginname">
<br>
密码:<br>
<input type="text" name="password">
性别:
<input type="radio" name="sex" value="male" checked>男
<br>
<input type="radio" name="sex" value="female">女
<br><br>
<input type="submit" value="Submit">
</form>