ExtJs4 combox下拉列表

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xtype:'combo',                    fieldLabel: '发件人',                    afterLabelTextTpl: required,                    allowBlank: false,                    name:'sendBoxForm.fromUserName',                    typeAhead: true,                triggerAction:'all',                lazyInit:false,                loadingText:'正在加载...',                mode: 'remote',                emptyText:'请选择...',                valueField: 'mailAddress',                displayField: 'fromMail',                store:Ext.create('Ext.data.Store', {                autoLoad: true,                proxy: {                type: 'ajax',                url: basePath+'/postbox/findMailAddress.action',                reader: {                type: 'json',                 root: 'postboxSite'                }                },                fields: ['fromMail','mailAddress'],                listeners: {                beforeload: function (store, e) {                Ext.apply(store.proxy.extraParams,{'userName':currentUserName});                  }                }                }),                    anchor:'40%'