如何在ag-grid中的数字(仅数字)单元格上退格？

// 列定义
var columnDefs = [
  { headerName: "数字列", field: "number", editable: true, cellEditor: "agNumericCellEditor" }
];

// 表格配置项
var gridOptions = {
  columnDefs: columnDefs,
  onCellEditingStarted: function(event) {
    event.api.cellEditingStarted(event);
    var oldValue = event.value;
    event.node.setDataValue('oldValue', oldValue); // 记录初始值
  },
  onCellEditingStopped: function(event) {
    event.api.cellEditingStopped(event);
    var oldValue = event.node.data.oldValue;
    var newValue = event.node.data.number;
    if (newValue !== oldValue) {
      // 处理退格操作
      event.node.setDataValue('number', oldValue); // 还原为初始值
    }
  }
};

// 创建表格
var gridDiv = document.querySelector('#myGrid');
new agGrid.Grid(gridDiv, gridOptions);