Element.remove('DIVID') Element.replace('DIVID','待替换内容'); <form method="post" action="http://192.168.0.109:8888/magento/greeting.php" id="test-form" name="test-form"> <div id="div1"> <label for="name">Enter your name:</label> <input id="username" name="username" type="text" /> <input id="password" name="password" type="text" /> <input id="testbutton" name="testbutton" type="button" value="testbutton" > </div> <div id="divResult" ></div> </form> Ajax.js Event.observe(window, 'load', init, false); function init(){ Event.observe('testbutton', 'click', replaceDiv1); } function replaceDiv1(){ Element.remove('divResult');//删除层 Element.replace('divResult','abc');//替换层的内容 }