jQuery EasyUI를 사용하여 열 숨기기 및 표시 기능을 구현하는 방법

<link rel="stylesheet" type="text/css" href="jquery-easyui-1.8.0/themes/default/easyui.css">
<link rel="stylesheet" type="text/css" href="jquery-easyui-1.8.0/themes/icon.css">
<script type="text/javascript" src="jquery-easyui-1.8.0/jquery.min.js"></script>
<script type="text/javascript" src="jquery-easyui-1.8.0/jquery.easyui.min.js"></script>

var data = [
  {"id":1,"name":"张三","age":20,"gender":"男"},
  {"id":2,"name":"李四","age":22,"gender":"男"},
  {"id":3,"name":"王五","age":23,"gender":"女"},
  {"id":4,"name":"赵六","age":21,"gender":"女"},
  {"id":5,"name":"钱七","age":25,"gender":"男"}
];

$("#datagrid").datagrid({
  columns:[[
    {field:"id",title:"编号",width:100},
    {field:"name",title:"姓名",width:100},
    {field:"age",title:"年龄",width:100},
    {field:"gender",title:"性别",width:100}
  ]],
  data:data
});

$.extend($.fn.datagrid.defaults,{
  columnMenu:{
    items:[{
      text:"显示/隐藏",
      iconCls:"icon-columns",
      handler:function(item){
        var opts = $(this).datagrid("options");
        if(item.checked){
          $(this).datagrid("hideColumn",item.value);
        }else{
          $(this).datagrid("showColumn",item.value);
        }
        $(this).datagrid("columnMoving");
        $(this).datagrid("fitColumns");
      },
      disabled:true
    }]
  },
  onHeaderContextMenu:function(e,field){
    e.preventDefault();
    var grid = $(this);
    if(!grid.datagrid("getColumnFields",true).length){
      return;
    }
    if(field){
      grid.datagrid("columnMenu").menu("show",{
        left:e.pageX,
        top:e.pageY
      });
      var menuItem = grid.datagrid("columnMenu").menu("getItem",field);
      if(menuItem){
        grid.datagrid("columnMenu").menu("setIcon",{
          target:menuItem.target,
          iconCls:grid.datagrid("isColumnHidden",field) ? "icon-unchecked" : "icon-checked"
        });
        grid.datagrid("columnMenu").menu("setItemState",{
          target:menuItem.target,
          disabled:false
        });
      }else{
        grid.datagrid("columnMenu").menu("setItemState",{
          target:grid.datagrid("columnMenu").menu("getItem",0).target,
          disabled:true
        });
      }
    }
  }
});