//-------------------------------------Grid为单行选择模式
       //var sm = new Ext.grid.RowSelectionModel({ singleSelect: true });
       //---------------------------------------Grid为带复选框的模式
       var sm = new Ext.grid.CheckboxSelectionModel({ dataIndex: "QY_ZHILBOID" });
       //---------------------------------------列头
       var cm = new Ext.grid.ColumnModel([
            new Ext.grid.RowNumberer({ header: "", width: 20, sortable: true }),
            sm,
            { header: "煤矿<br/>&nbsp", dataIndex: "MINGC_MK", width: 100, sortable: true },
{ header: "批次<br/>&nbsp", dataIndex: "PICH", windh: 30 }