type_dispatch:基于参数类型的多方法调度

type_dispatch 允许函数根据参数类型分派到其他函数 用法 var type_dispatch = require ( 'type_dispatch' ) ; function A ( ) { } function B ( ) { this . name = "BBB" ; } A . prototype . method1 = type_dispatch ( [ ] , function ( ) { console . log ( "no args" ) ; } , [ String , B ] , function ( a_string , instanceOfB ) { console . log ( "got two args: " , a_string , instanceOfB ) ; } ) ; var a = new A ( ) ; a