jquery在這方面則正好相反，它的UI都以插件形式提供，可以需要什么就引用什么，所以非常小巧靈活，但由于插件往往是由不同的人或者團隊來提供，界面和接口往往就不那么一致。反正是各有千秋吧。
今天學習extjs中的grid，它可以說是功能強大，無出其右，只有你想不到的，沒有它做不到的，呵呵，好像是有點夸張了。好，不說廢話了，我們就從最簡單的grid開始，一步步來看看extjs給我們提供的grid究竟給我們提供了哪些功能。
一個grid包括一些行和列，在extjs里邊，列由Ext.grid.ColumnModel來管理，我們來看看如何創建一個ColumnModel對象：
代碼如下:
var cm = new Ext.grid.ColumnModel([
{id:'company',header: "Company", width: 160, sortable: true, dataIndex: 'company'},
{header: "Price", width: 75, sortable: true, dataIndex: 'price'},
{header: "Change", width: 75, sortable: true, dataIndex: 'change'},
{header: "% Change", width: 75, sortable: true, dataIndex: 'pctChange'},
{header: "Last Updated", width: 85, sortable: true, dataIndex: 'lastChange'}
]);
這里定義了五個列,列可以通過參數進行配置：id用來標識列，在css中使用該id可以對整列所有的單元格設置樣式，可自動擴充的列也根據這個id來標識；header是列名字；width是列的寬度;sortable用來指明列是否可排序，dataIndex，先不管它。比較常用的參數還有：editable，指示列是否可編輯；renderer，指示列如何來呈現，后邊會再詳細介紹它。
有了列，我們還需要一些數據來填充行，構造一個數組吧：
代碼如下:
var myData = [
['3m Co',71.72,0.02,0.03,'9/1 12:00am'],
['Alcoa Inc',29.01,0.42,1.47,'9/1 12:00am'],
['Altria Group Inc',83.81,0.28,0.34,'9/1 12:00am'],
['American Express Company',52.55,0.01,0.02,'9/1 12:00am'],
['American International Group, Inc.',64.13,0.31,0.49,'9/1 12:00am'],
['AT&T Inc.',31.61,-0.48,-1.54,'9/1 12:00am'],
['Boeing Co.',75.43,0.53,0.71,'9/1 12:00am'],
['Caterpillar Inc.',67.27,0.92,1.39,'9/1 12:00am'],
['Citigroup, Inc.',49.37,0.02,0.04,'9/1 12:00am'],
['E.I. du Pont de Nemours and Company',40.48,0.51,1.28,'9/1 12:00am'],
['Exxon Mobil Corp',68.1,-0.43,-0.64,'9/1 12:00am'],
['General Electric Company',34.14,-0.08,-0.23,'9/1 12:00am'],
['General Motors Corporation',30.27,1.09,3.74,'9/1 12:00am'],
['Hewlett-Packard Co.',36.53,-0.03,-0.08,'9/1 12:00am'],
['Honeywell Intl Inc',38.77,0.05,0.13,'9/1 12:00am'],
['Intel Corporation',19.88,0.31,1.58,'9/1 12:00am'],
['International Business Machines',81.41,0.44,0.54,'9/1 12:00am'],
['Johnson & Johnson',64.72,0.06,0.09,'9/1 12:00am'],
['JP Morgan & Chase & Co',45.73,0.07,0.15,'9/1 12:00am'],
['McDonald/'s Corporation',36.76,0.86,2.40,'9/1 12:00am'],
['Merck & Co., Inc.',40.96,0.41,1.01,'9/1 12:00am'],
['Microsoft Corporation',25.84,0.14,0.54,'9/1 12:00am'],
['Pfizer Inc',27.96,0.4,1.45,'9/1 12:00am'],
