这是HTML和脚本
 <script>  $(document).ready(function(){  
 $(".update_button").click(function(){ 
 var update_post = $("#post").val();
 alert('Post is '+ update_post +'.');
 return false;
 });
 });
 </script>
 <body>
     <fieldset style="width:600px; height:550px">
       <textarea id="post" class="uiwysiwyg nothing"><?php echo $prvpost; ?></textarea>
       <input type="submit" value="Post" id="updt_button" class="update_button"/>
     </fieldset> </body>
注意:class="uiwysiwyg nothing" 是一个包含所见即所得命令的脚本
但代码有效:
 <body onsubmit="alert('Update: ' + document.getElementById('post').value); return false;">
     <fieldset style="width:600px; height:550px">
       <textarea id="post" class="uiwysiwyg nothing"><?php echo $prvpost; ?></textarea>
       <input type="submit" value="Post" id="updt_button" class="update_button"/>
     </fieldset>
 </body>