Ext.onReady(function() {
      var store = Ext.create('Ext.data.Store', {
          storeId: 'employeeStore',         fields: ['name', 'seniority', 'department'],         groupField: 'department',         data: {
              'employees': [                 {"name": "Michael Scott", "seniority": 7, "department": "Management"},                 {"name": "Dwight Schrute", "seniority": 2, "department": "Sales"},                 {"name": "Jim Halpert", "seniority": 3, "department": "Sales"},                 {"name": "Kevin Malone", "seniority": 4, "department": "Accounting"},                 {"name": "Angela Martin", "seniority": 5, "department": "Accounting"}             ]         },         proxy: {
              type: 'memory',             reader: {
                  type: 'json',                 root: 'employees'             }         }     });    var grid = Ext.create('Ext.grid.Panel', {
          title: 'Employees',        name:'mygrid',         store: Ext.data.StoreManager.lookup('employeeStore'),         dockedItems: [{
              dock: 'top',             xtype: 'toolbar',             items: [{
                  tooltip: '关闭所有',                 text: '关闭所有',                 enableToggle: true,                 pressed: true,                 handler: function(){
                      var me=this;                     var view = me.up('grid');                     console.log(view);                     view.view.features[0].collapseAll();                 }             }, {
                      tooltip: '展开所有',                     text: '展开所有',                     enableToggle: true,                     pressed: true,                     handler: function(){
                          var me=this;                         var view = me.up('grid');                         console.log(view);                         view.view.features[0].expandAll();                     }                 }]         }],         columns: [             {text: 'Name', dataIndex: 'name'},             {text: 'Seniority', dataIndex: 'seniority'}         ],         features: [             {
                  ftype: 'grouping'             }         ],         listeners: {
              groupclick: function (view, node, group, e, eOpts) {
                 view.features[0].collapseAll();                view.features[0].expand(group);             }         },         width: '100%',         height: '100%',         renderTo: Ext.getBody()     }); });