jQuery EasyUI中DataGird动态生成列的方法

<table id="dg"></table><script>function easyUIDataGrid(medid) {var $datagrid = {};var columns = new Array();$datagrid.title = "";$datagrid.height = $(window).height() - 31;$datagrid.width = $(window).width();$datagrid.sortName = "dt";$datagrid.sortOrder = "desc";$datagrid.idField = "id";var param = { "medid": medid };$.ajax({url: 'getCol.page',type: 'post',data: "medid=" + medid,dataType: "json",async: false,success: function (returnValue) {　　　　　　　　　　　　//异步获取要动态生成的列 别名，宽度也可以var arr = returnValue;$.each(arr, function (i, item) {columns.push({ "field": item.colname, "title": item.colalias, "width": 100, "sortable": true });});$datagrid.columns = new Array(columns);$('#dg').datagrid($datagrid);}});}</script>