看不懂这段javascript ，求指导

[叶尽缘何]

<script type="text/javascript" >
	$(function() {
	
	//$("#northHot").css('height',$(this).height()*0.4);
	//$("#centerarea").css('height',$(this).height()*0.4);
		$('#dg1').datagrid(
				{

					onSelect : function(index, row) {
						$('#cc1').attr(
								'src',
								'AllToNewsAction.action?topic_id='
										+ row.id);
					},
					url : 'hotTopicAllAction.action',
					queryParams : {
						genusId : 0

					},
					columns : [ [ {
						field : 'title',
						title : '话题',
						width : 200
					}, {
						field : 'genus',
						title : '种类',
						align:'center',
						width : 50,
						formatter : function(val, rec) {
							if (val == 1) {
								return '<span style="color:red;">政治</span>';
							} if (val == 2) {
								return '<span style="color:blue;">军事</span>';
							}if (val == 3) {
								return '<span style="color:Teal;">财经</span>';
							}if (val == 4) {
								return '<span style="color:#66CCFF;">社会</span>';
							}if (val == 5) {
								return '<span style="color:black;">两岸</span>';
							}else{
							return '<span style="color:black;">其他</span>';
							}
						}
						
					}, {
						field : 'newhot',
						title : '话题热度',
						width : 50,
						align:'right',
						formatter : function(val, rec) {
							return val.toFixed(2);

						}
					} ] ],
					toolbar : [  {
						text : '今日热点话题',
						iconCls : 'icon-day',
						handler : function() {
							document.location.href = "topic/dayhotTopicNews.jsp";
						}
					}, '-', {
						text : '上周热点话题',
						iconCls : 'icon-week',
						handler : function() {
							document.location.href = "topic/weekhotTopicNews.jsp";
						}
					}, '-', {
						text : '话题地图模式',
						iconCls : 'icon-map',
						handler : function() {
						     var  row=$('#dg1').datagrid('getSelected');
						     document.location.href ='maps/monthLocation.jsp?topic_id='+row.id;
						}
					}], 
					 
					

					pagination : true,

					onLoadSuccess : function() {
						var rows = $(this).datagrid('getRows');
						if (rows.length) {
							$(this).datagrid('selectRow', 0);
						}
					}
				});
				$(".datagrid-toolbar").append($("#datagridsearch"));

		//菜单
		$('#ccMenu')
				.combobox(
						{
							formatter : function(row) {
								var imageFile = 'images/' + row.icon;
								return '<img class="item-img" src="'+imageFile+'"/><span class="item-text">'
										+ row.text + '</span>';
							},
							onSelect : function(record) {
								$('#dg1').datagrid('reload', {
									genusId : record.id
								});

							}
						});

	});
</script>

[斯洛文尼亚旅游]

自己找easyui的api来看