Extjs4 GridPanel 的几种样式使用介绍(3)

Ext.define('TestResult', {
                extend: 'Ext.data.Model',
                fields: ['student', {
                    name: 'mark',
                    type: 'int'
                }]
            });

var grid = Ext.create('Ext.grid.Panel', {
                width: 200,
                height: 140,
                renderTo: document.body,
                features: [{
                    ftype: 'summary'
                }],
                store: {
                    model: 'TestResult',
                    data: [{
                        student: 'Student 1',
                        mark: 84
                    }, {
                        student: 'Student 2',
                        mark: 72
                    }, {
                        student: 'Student 3',
                        mark: 96
                    }, {
                        student: 'Student 4',
                        mark: 68
                    }]
                },
                columns: [{
                    dataIndex: 'student',
                    text: 'Name',
                    summaryType: 'count',  //进行汇总的列名
                    summaryRenderer: function (value) {
                        grid.getStore()
                        return Ext.String.format('{0} student{1}', value, value !== 1 ? 's' : '');
                    }
                }, {
                    dataIndex: 'mark',
                    text: 'Mark',
                    summaryType: 'average'
                }]
            })
            var grid = Ext.create('Ext.grid.Panel', {
                width: 200,
                height: 140,
                renderTo: document.body,
                features: [{
                    ftype: 'summary'
                }],
                store: {
                    model: 'TestResult',
                    data: [{
                        student: 'Student 1',
                        mark: 84
                    }, {
                        student: 'Student 2',
                        mark: 72
                    }, {
                        student: 'Student 3',
                        mark: 96
                    }, {
                        student: 'Student 4',
                        mark: 68
                    }]
                },
                columns: [{
                    dataIndex: 'student',
                    text: 'Name',
                    summaryType: 'count',  //进行汇总的列名
                    summaryRenderer: function (value) {
                      //  grid.getStore()
                        return Ext.String.format('{0} student{1}', value, value !== 1 ? 's' : '');
                    }
                }, {
                    dataIndex: 'mark',
                    text: 'Mark',
                    summaryType: 'average',