ag-grid实时监测复选框变化

        <ag-grid-vue
                class="table ag-theme-balham"
                v-show="isSee"
                id="myGrid"
                :columnDefs="columnDefs"
                :rowData="rowData"
                :sideBar="sideBar"
                :enableColResize="true"
                row-selection="multiple"
                @selection-changed="onSelectionChanged"
                @gridReady="onGridReady"
                :tooltipShowDelay="tooltipShowDelay"
                :localeText="localeText"
                :height="tableMaxHeight"
        >
        </ag-grid-vue>

    //监测复选框选中的个数
    onSelectionChanged(){
      var selRows = this.gridApi.getSelectedRows();
      this.selectedData = selRows.length;
    }