easyui的combobox中onLoadSuccess多次加载产生的问题

  $(‘#comboTestUnit‘).combobox({
        valueField: ‘UnitId‘,
        textField: ‘UnitName‘,
        url: ‘/Bridge/getBridgeUnitList?BridgeId=‘ + bridgeId,
        onLoadSuccess: function (data) {
            if ($(‘#hiddenBridgeId‘).val()) { //根据隐藏id判断是新增还是编辑
                for (var i = 0; i < data.length; i++) {
                    if (data[i].UnitIsImportant == 1) {
                        $("#comboTestUnit").combobox(‘select‘, data[i].UnitId);
                        $(‘#comboStructureStyle‘).combobox(‘setValue‘, data[i].UnitIsImportant == 1 ? data[i].StructureStyle : ‘‘);
                        $(‘#comboUnitIsImportant‘).combobox(‘setValue‘, data[i].UnitIsImportant == 1 ? data[i].UnitIsImportant : ‘0‘);
                        $(‘#txtSpanRange‘).textbox(‘setValue‘, data[i].UnitIsImportant == 1 ? data[i].SpanNum : ‘0‘);
                        break;
                    }
                }
            } else {
                $(‘#comboTestUnit‘).combobox({
                    valueField: ‘UnitId‘,
                    textField: ‘UnitName‘,
                    url: ‘/Bridge/getBridgeUnitList?BridgeId=‘,//新增时需要清空下列列表中的值
                    onLoadSuccess: function (data) {

                    }
                });
            }
        }
    })