What scenarios are extjs and jquery applicable?

Compare whether extjsjquery charges fees. The Extjs3 version starts to charge for commercial purposes. The open-source free library file size is kb20kb. Do you have images and CSS to load? Do you support ui-rich ui? Do you want to use plug-ins? object programming... syntaxHighlighter. all (); comparison: extjs jquery is charged. Extjs3 is charged for commercial purposes. The open-source free library file size is kb, 20kb. Are there images and CSS to be loaded? Are there any support for ui rich ui? Plug-ins should be used support for Object-Oriented Programming (strong code reusability) granularity extjs is not supported. It is based on component-level jquery. It is mainly used to simplify Dom operation compatibility. It is a bit of a problem. Compatibility debugging is not easy to debug. Combined with firebug, a relatively direct code method is used to form a page file + load a large number of js files. effect, makes your entire application on one page attached to the traditional multi-page form applicable scenario LAN, internal enterprise management system Internet applications