如何读取以下代码中的验证码
<script language="javascript" type="text/javascript"><div class="checkCode" id="Validater_Show" style="display: none">
<label for="txtCheckCode" class="loginLabel">
验证码：</label><input name="txtCheckCode" type="text" maxlength="6" id="txtCheckCode" style="width: 56px;" tabindex="3" onfocus="return ShowCheckcode4input(this);" />
<a title="点击更换验证码" onclick="return ShowCheckcode();" href="#" style="cursor: pointer;">我看不清!</a>
<br />
<div class="code_img">
<div id="Validater1" onclick='return ShowCheckcode();'>
</div>
<div class="code_text">
验证码看不到？<a href="https://reg. target="_blank">点此查看帮助</a>
</div>
</div>
</div>
