$('#self_data').cxSelect({ selects: ['province', 'city', 'area'], jsonName: 'name', jsonValue: 'value', });

这是一段使用jQuery插件cxSelect实现的三级联动下拉框的代码。其中，selects数组中的三个元素分别代表三个下拉框的id，jsonName和jsonValue分别代表json数据中的文本和值的字段名。具体实现效果是：当选择省份时，城市下拉框会根据选择的省份动态加载对应的城市选项；当选择城市时，区域下拉框会根据选择的城市动态加载对应的区域选项。

$('#self_data').cxSelect({
    selects: ['province', 'city', 'area'],
    jsonName: 'name',
    jsonValue: 'value',
});

相关问题

pd.concat((train_data.iloc[:, 1:-1], test_data.iloc[:, 1:]))

This line of code is concatenating two dataframes:

- `train_data.iloc[:, 1:-1]`: This selects all rows and columns from the second column up until the second-to-last column from the `train_data` dataframe.

- `test_data.iloc[:, 1:]`: This selects all rows and all columns from the second column to the end of the `test_data` dataframe.

The `pd.concat()` function is used to concatenate these two dataframes along axis 0 (i.e., vertically) into a single dataframe. The resulting dataframe will contain all the rows from `train_data` and `test_data` except for the last column of `train_data` (which contains the target variable).

X_train = X_train.iloc[:,3]

This code selects the fourth column (index 3) of the pandas DataFrame X_train and assigns it to a new DataFrame called X_train.

Note: The resulting DataFrame X_train will only have one column.