ext3.0学习 renderer

<script type="text/javascript" src="extJs/adapter/ext/ext-base.js"></script>  <script type="text/javascript" src="extJs/ext-all.js"></script>  <link rel="stylesheet" type="text/css" href="extJs/resources/css/ext-all.css"/>  <script type="text/javascript">   function abc(value){        return String.format('<a href="http://{0}">{0}</a>',value);     }    Ext.onReady(function(){    var data=[[1,'百度','www.baidu.com'],        [2,'谷歌','www.google.com'],        [3,'迅雷','www.xunlei.com'],        [4,'腾讯','www.qq.com']];    var store=new Ext.data.SimpleStore({data:data,fields:["id","name","homepage"]});    var colM = new Ext.grid.ColumnModel([{header:"中文名称",dataIndex:"name",sortable:true},               {header:"网址",dataIndex:"homepage",renderer:abc}              ]);    var grid = new Ext.grid.GridPanel({     renderTo:"hello",     title:"中国开发团队",     height:150,     width:600,     /*     columns:[{header:"中文名称",dataIndex:"name",sortable:true},        {header:"网址",dataIndex:"homepage"}     ],     */     cm:colM,     store:store,     autoExpandColumn:2    });   });  </script>