Data access and update issues in ExtJS Store_extjs

You can use add(Ext.data.Record[] records) or add(Ext.data.Record record) to add one or more records to the end of the store. For example:

The add function will add new data to the end of the store, which may change the original sorting method. Cause damage, if you want to keep order, you should use addSorted, the calling method is the same as add.
You can use the insert method to insert a record into a specified location, such as:

Delete Operations can use the remove and removeAll functions, such as:

Modify the data in the store:

Modification After recording the internal data, you can undo all modifications by executing rejectChanges(), or commit data modifications by commitChanges.