JS動態給EasyUI的datagrid添加列

var count2=$('#daduiz').val();
	var columns2 =new Array(); 
	columns2.push({field:'k',checkbox:true});
	columns2.push({field:'qq',hidden:'true'});
	columns2.push({field:'qq', title:'v', width:100,halign:'center',align:'left',formatter:_setContent,sortable:true});
	columns2.push({field:'b', title:'b', width:80,align:'left',halign:'center', sortable:true});
	columns2.push({field:'q', title:'q', width:150,align:'left',halign:'center',formatter:_setContent, sortable:true});

if(count1=='1'){
		columns2.push({field:'a', title:'a', width:100,align:'center',halign:'center',formatter:_setContent,sortable:true});
		columns2.push({field:'DO_OPTION', title:'操做', width:100,align:'center',halign:'center',formatter:_doOption,sortable:true});
	}else if(count2=='1'){
		columns2.push({field:'c', title:'c', width:100,align:'center',halign:'center',formatter:_setContent,sortable:true});	
	}


$('#tt').datagrid({
		iconCls:'myicon-table',
		fitColumns:true,
		rownumbers:true,
		singleSelect:false,
		toolbar:'#tb',
		pageSize:10,
		pagination:'true',
		pageList:[10,20,50,100],
		url:'vvv_vvvt.do',
		idField:'vv',
		remoteSort:true,
		queryParams: {
			cityCode:$('#cityCode').val(),
			//taskType:$('#taskType').combobox('getValue'),
			taskMonth:$('#taskMonth').val(),
			userDeptCode:$('#userDeptCode').val(),
			userStation:$('#userStation').val()
		},
		columns:[columns2]
		
	});