<h2>下拉图片</h2> <p>移动鼠标到图片上显示下拉内容。</p> <div class="dropdown"> <img src="/upload2/statics/images/w3c/intro.png" alt="Trolltunga Norway" width="100" height="50"> <div class="dropdown-content"> <img src="/upload2/statics/images/w3c/intro.png" alt="Trolltunga Norway" width="400" height="200"> <div class="desc">学技术,从W3Cschool开始!</div> </div> </div>