把JS代码和Ext框架运行在服务器端？

function ExtJaxerProxy(params) {
   var fld = [], q = [];
   var fields = params.fields;
   for (var i = 0; i < fields.length; i++) {
       if (typeof fields[i] == 'string') {
           fld.push(fields[i]);
           q.push('?');
       } else if (typeof fields[i] == 'object') {
           fld.push(fields[i].name);
           q.push('?');
       }
   }
 
   var qp = fld;
 
   var query = 'SELECT ' + fld.join(',') + ' FROM ' + params.table;
   if (params.sortInfo) {
       query += ' ORDER BY ' + params.sortInfo.sort + ' '
               + params.sortInfo.dir;
       qp.push(params.sortInfo.sort);
       qp.push(params.sortInfo.dir);
   }
   if (params.start && params.limit) {
       query += ' START ' + params.start + ' LIMIT ' + params.limit;
       qp.push(params.start);
       qp.push(params.limit);
   }
   return Jaxer.DB.execute(query);
}

Ext.data.JaxerStore = function(config) {
   var params = Ext.apply({
       fields : config.fields,
       table : config.table
   }, config.baseParams || {});
 
   Ext.data.JaxerStore.superclass.constructor.call(this, 
       Ext.applyIf(config, {
       reader : new Ext.data.JsonReader(Ext.apply({
           root : 'rows'
       }, config.readerConfig), config.fields)
   }));
   ExtJaxerProxyAsync(this.loadData.createDelegate(this), params);
};
Ext.extend(Ext.data.JaxerStore, Ext.data.Store);

Ext.onReady(function() {
   var store = new Ext.data.JaxerStore({
       table : 'demo',
       fields : [
           {name : 'name'},
           {name : 'phone'},
           {name : 'email'}
       ],
       readerConfig : {
           sortInfo : {
               sort : 'name',
               dir : 'asc'
           }
       }
   });
 
   // create the Grid
   var grid = new Ext.grid.GridPanel({
       store : store,
       columns : [
           {header : "Name", sortable : true, dataIndex : 'name'},
           {header : "Phone #", sortable : true, dataIndex : 'phone'},
           {header : "Email", sortable : true, dataIndex : 'email'}
       ],
       viewConfig : {
           forceFit : true
       },
       stripeRows : true,
       height : 350,
       width : 680,
       title : 'Jaxer Demo Grid',
       renderTo : Ext.getBody()
   });
});

function loadPosts() {
   var vals = Jaxer.DB.execute('select id, title, body, perm from posts');
 
   var tpl = new Ext.XTemplate('<tpl for="rows">',
           '<div id="post-{id}" class="post">',
           '<h2><a href="/jxtest/post/{perm}">{title}</a></h2>',
           '<p class="post-body">{body:this.formatBody}</p>', '</div>',
           '</tpl>', {
               formatBody : function(val, all) {
                   if (val.length > 300) {
                       return Ext.util.Format.ellipsis(val, 300)
                               + '<a href="/jxtest/post/' + all.perm
                               + '">Read More &raquo;</a>';
                   } else {
                       return val;
                   }
               }
           });
 
   tpl.overwrite('posts-main', vals);
}