Implementation of Google map class instances in class inheritance

As we all know,ProgramIs not perfect. The following is the method of Google map class inheritance implementation. First, copy the class inheritance in Javascript design patterns:

 
Function extend (subclass, superclass) {function f () {} f. prototype = superclass. prototype; subclass. prototype = new F (); subclass. prototype. constructor = subclass; subclass. superclass = superclass. prototype; If (superclass. prototype. constructor = object. prototype. constructor) {superclass. prototype. constructor = superclass;} function submap (ELM, config) {console. log (submap. superclass. constructor); submap. superclass. constructor. call (this, elm, config);} extend (submap, Google. maps. map); var mapobj1 = new submap ($ ('# map_box') [0], {ZOOM: 13, center: new Google. maps. latlng (31.227, 121.519), maptypeid: Google. maps. maptypeid. roadmap });
 

The above Google map cannot be displayed on the page.CodeThere is a problem. The above implementation is rewritten as follows:

Function extend (subclass, superclass) {function f () {} f. prototype = superclass. prototype; subclass. prototype = new F (); subclass. prototype. constructor = subclass; subclass. superclass = superclass;} function submap (ELM, config) {submap. superclass. call (this, elm, config);} extend (submap, Google. maps. map); var mapobj1 = new submap ($ ('# map_box') [0], {ZOOM: 13, center: new Google. maps. latlng (31.227, 121.519), maptypeid: Google. maps. maptypeid. roadmap });
 

Well, Google Maps display well on the page.

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