Extend.js Mixin、Polyfill、Fallback函数

扩展.js Mixin、Polyfill、Fallback函数。文档（）如何使用浏览器< script src = "lib/Extend.js" > < script > Extend.tree(global, { "Array" : { "name" : "Array" , "isArray" : Array_isArray , "prototype" : { "forEach" : Array_forEach } } , "String" : { "name" : "String" , "prototype" : { "trim" : String_trim }