easyUi的dataGrid动态改变列、列标题等。

参考官方文档：http://www.jeasyui.net/tutorial/27.html，其中说明：“请记住，我们已经定义了其他属性，比如：url、width、height 等等。我们不需要再一次定义它们，我们定义那些我们需要改变的。”

实际代码：

function initList() {    //初始化表格    $('#matList').datagrid({        height: 300,        url: '',         idField: 'sID',        striped: true,        fitColumns: true,        singleSelect: false,        rownumbers: true,        pagination: false,        nowrap: false,        showFooter: true,        columns: [            getColumns()        ],        toolbar: [            {                text: '选择项目',                iconCls: 'icon-add',                handler: handlerAdd            }            ,            {                text: '确认选择',                iconCls: 'icon-edit',                handler: handlerAccept            },            {                text: "清空表格",                iconCls: "icon-cancel",                handler: function () { $('#matList').datagrid('loadData', { total: 0, rows: [] }); }            }        ],        onBeforeLoad: function (param) {        },        onLoadSuccess: function (data) {        },        onLoadError: function () {        },        onClickCell: function (rowIndex, field, value) {            onClickCell(rowIndex, field);        }    });}//列function getColumns() {    var cols =    [        { field: 'ID', title: '子项ID', width: 90, hidden: true },        { field: 'sItemID', title: '商品编号', width: 90, hidden: true },        { field: 'sItemIDName', title: '商品名称', width: 90, align: 'left' },        { field: 'sUnit', title: '规格', width: 50, align: 'left' },        { field: 'sUnitName', title: '单位', width: 50, align: 'left' },        {   //仓库编号列，标题从业务类型中读取，数据来自数据集            field: 'sStore', title: getStoreCaption(), width: 90, align: 'left',            editor: {                type: 'combobox',                editable: false,                options: {                    valueField: 'sID',                    textField: 'sName',                    data: storeComboboxDatasource                }            },            formatter: function (value, row, index) {                for (var i = 0; i < storeComboboxDatasource.length; i++) {                    if (storeComboboxDatasource[i].sID == value) {                        return storeComboboxDatasource[i].sName;                    }                }                return row["sStore"];            }        },        {            field: 'nCount', title: '数量', width: 50, align: 'left',            editor: {                type: 'numberbox',                options: {                    min: 0,                    precision: 2                }            }        },        {            field: 'nPrice', title: '单价', width: 50, align: 'right', editor: {                type: 'numberbox',                options: {                    min: 0,                    precision: 2                }            }        },        {            field: 'nAgio', title: '优惠金额', width: 50, align: 'right', editor: {                type: 'numberbox',                options: {                    min: 0,                    precision: 2                }            }        },        { field: 'nMoney', title: '金额', width: 50, align: 'right' },        {            field: 'op', title: '操作', width: 80, align: 'left', formatter: function (value, row, index) {                return "移除";            }        }    ];    return cols;}function getStoreCaption() {    var s = "";    if (workTable != null) s = workTable.sStorerCaption;    if (s == null || s == "") return "仓库";    return s;}