Ext4grid显示问题

我在网上找的代码，为什么我的什么都不显示。

Ext.onReady(function() {

          Ext.define('simpsonsStore',{

            extend:'Ext.data.Store',

            fields:['name', 'email', 'phone'],

            data:{'items':[

                {"name":"Lisa", "email":"lisa@simpsons.com", "phone":"555-111-1224"},

                {"name":"Bart", "email":"bart@simpsons.com", "phone":"555--222-1234"},

                {"name":"Homer", "email":"home@simpsons.com", "phone":"555-222-1244"},

                {"name":"Marge", "email":"marge@simpsons.com", "phone":"555-222-1254"}

            ]},

            proxy: {

                type: 'memory',

                reader: {

                    type: 'json',

                    root: 'items'

                }

            }

        }); 

            



          Ext.create('Ext.grid.Panel', {

              title: 'Simpsons',

              store: new simpsonsStore,

              columns: [

                  {header: 'Name',  dataIndex: 'name'},

                  {header: 'Email', dataIndex: 'email', flex:1},

                  {header: 'Phone', dataIndex: 'phone'}

              ],

              height: 200,

              width: 400,

              renderTo: Ext.getBody()

          });

    })     

6 个解决方案