预览图标功能的实现

$('#data-datagrid').treegrid({
		url:'../admin/menu/list',		
		rownumbers:true,		
		singleSelect:true,
		pageSize:20,           
		pagination:true,//是否分页
		multiSort:true, 
		fitColumns:true,
		idField:'id',
		treeField:'name',
		fit:true,
		columns:[[
			{ field:'name',title:'菜单名称',width:100,sortable:true},
			{ field:'url',title:'菜单URL',width:100,sortable:true},
			{ field:'icon',title:'图标icon',width:100,formatter:function(value,index,row){
                var test='<a class="' + value +'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</a>'
                return test + value;//预览图标
				}},
		]]
	});