Javascript 表单 AJAX 样式

Question

我使用以下代码创建一个简单的表单。如何使当有人单击其中一个输入字段时边框改变颜色？提前致谢

<style>
.texta {  
  color: #CDCBCB;  
  background-color: #FFFFFF;  
  border: 1px solid #E2E2E2;
  font-style:italic
}  

.sendbutton {
    background:#F6F6F6; color:#999999;
    border: 1px solid #E2E2E2;  
    cursor:pointer;
    padding:5px 10px;
    -webkit-border-radius:8px
}
</style>


<form action="mailto:email@email.com" method="post" enctype="text/plain">
<div style="height:12px;"><input type="text" name="name" value="Name (required)" size="40" class="texta"></div><br>
<div style="height:12px;"><input type="text" name="mail" value="Email (required)" size="40" class="texta"></div><br>
<div style="height:12px;"><input type="text" name="comment" value="Subject (required)" size="40" class="texta"></div><br>
<textarea name="Message" value="Message (required)" cols="40" rows="6" class="texta"></textarea><br>
<br><input type="submit" value="&nbsp; &nbsp; Send &nbsp;&nbsp;" class="sendbutton">
</form>

Answer 1

为 .texta:focus 添加 CSS 规则并设置 border-color。