简单的ext 表格显示不出来

    <script type="text/javascript">



        Ext.onReady(function(){
            Ext.MessageBox.alert("hello","Hello,easyjf open source");
            var data = [
               [1,'张三','男','20'],
               [2,'李四','男','21'],
               [3,'王五','女','22']
            ];

            var store = new Ext.data.SimpleStore({data:data,fields:["id","name","sex","age"]});

            var grid = new Ext.grid.GridPanel({
                 renderTo:"hello",
                 title:"706绿色网吧",
                 width:150,
                 height:600,

                 columns:[
                    {header:"姓名",dataIndex:"name"},
                    {header:"性别",dataIndex:"sex"},
                    {header:"年龄",dataIndex:"age"}
                 ],

        [align=left][/align]         store:store,
                 autoExpandColumn:2

            });
       });
    </script>
</head>

<body>
    <div id="hello">eee</div>
</body>

本地测试无问题.

检查你的ext类库引入是否正确.

用firebug看有没有详细报错