Ext2.x~3.x 获取 Ext.PagingToolbar 当前页数方法
pagingToolbar.getPageData().activePagevar store = grid.getStore();var start = store.baseParams.start;var limit = store.baseParams.limit;var pageToolbarObj = Ext.getCmp('pageToolbar'+title);var currentPageNum = pageToolbarObj.getPageData().activePage;start = limit * (currentPageNum -1);var end = limit * currentPageNum;

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