在EditorGridPanel中插入一行（经常在增加的时候用到）

function add(){
       alert('add');
       //定义一个新的row
       var row = new Ext.data.Record({
           function_id:'', //这里是和ColumnModel里面的dataIndex相互对应的
           function_name:'',
           function_url:'http://',
           function_alias:'',
           modify_user:'',
           is_default:''
       });
       grid.stopEditing();
       gridstore.insert(0,row);  //在第一行插入这一行 这个的调用对象是store
       grid.startEditing(0,1);   //在哪一行开始编辑
    }

var editorname = new Ext.form.TextField({
allowBlank : false,
maxLength : 120
});
var editorage = new Ext.form.TextField({
allowBlank : false,
maxLength : 120
});
var editorhobby = new Ext.form.TextField({
allowBlank : false,
maxLength : 120
});
var editorsport = new Ext.form.TextField({
allowBlank : false,
maxLength : 120
});

var gridstore = new Ext.data.Store({
proxy : new Ext.data.HttpProxy({
url:''
}),
reader:new Ext.data.JsonReader({
totalProperty:'totalProperty',
root:'root'
},[
{name:'name'},
{name:'age'},
{name:'hobby'},
{name:'sport'}
])
});

var sm = new Ext.grid.CheckboxSelectionModel();
//表格的cm属性.这里将sm设置在里头
var cm=new Ext.grid.ColumnModel([sm,
{header:'姓名',dataIndex:'name',editor:editorname},
{header:'年龄',dataIndex:'age',editor:editorage},
{header:'爱好',dataIndex:'hobby',editor:editorhobby},
{header:'运动',dataIndex:'sport',editor:editorsport}
]);

var grid = new Ext.grid.EditorGridPanel({
width:650,
height:290,
sm:sm,
cm:cm,
store:gridstore
});