表单验证

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    <table>

        <tr>
            <td>用户名</td>
            <td class="inputs">
                <input name="username" type="text" id="username">
                <br>
                <span id="username_err" class="err_msg" style="display: none">用户名不太受欢迎</span>
            </td>

        </tr>

        <tr>
            <td>密码</td>
            <td class="inputs">
                <input name="password" type="password" id="password">
                <br>
                <span id="password_err" class="err_msg" style="display: none">密码格式有误</span>
            </td>
        </tr>


        <tr>
            <td>手机号</td>
            <td class="inputs"><input name="tel" type="text" id="tel">
                <br>
                <span id="tel_err" class="err_msg" style="display: none">手机号格式有误</span>
            </td>
        </tr>

    </table>

    <div class="buttons">
        <input value="注 册" type="submit" id="reg_btn">
    </div>
    <br class="clear">
</form>