Code based on jquery loop map function_jquery

Without further ado, look at the code

If firebug is installed, the console will output the following tree structure:

Place name
Beijing
Tianjin
Shanghai
Ethnicity
Han Chinese
Tibetan
Uyghur

Note: The difference between $().each and $.each in jquery is that the former can only traverse arrays, while the latter can traverse Arrays and objects

Note: The place name ontology in the sinobook project is classified by type. The background package is a map (key is a relationship type, and the value is a list). The frontend can output it in the above way.