Tutorials:Creating a Loading Message(创建进度条)

Version 0.5
In version 0.5, the loading message is done through the use of callback functions
After printJavascript：
script type="text/javascript">
  xajax.callback.global.onRequest = function() {xajax.$('loading').style.display = 'block';}
  xajax.callback.global.beforeResponseProcessing = function() {xajax.$('loading').style.display='none';}
  /script>
In HTML somewhere
div id="loading">img src="images/loading.gif" alt="" /> Loading.../div>
in CSS somewhere
#loading {
    background: white;
    padding: 20px;
    border: 2px solid green;
    display: none; /* hidden */
    position: absolute;
    left: 50%;
    margin-left: -100px;
    top: 25%;
    width: 200px;
    /**/
        /*margin-top: -50;*/
    font-weight: bold;
    font-size: large;
    }
是不是太简单了？！