grid.on("cellclick",function(grid , rowIndex , cellIndex ,e){
var record = grid.getStore().getAt(rowIndex); //获取所在行的记录
var fieldName = grid.getColumnModel().getDataIndex(cellIndex );//获取单元格的索引名称
var callValue = record .get(fieldName);//获得单元格数据
//do something....
})