举个例子：
var options={protocal:'https:',__proto__: require('url').parse(url)}
var req=new http.ClientRequest(options,cb)
//error :connect ECONNREFUSED 127.0.0.1:80
回复 (2)
V
内部用了 util._extend end!
F
楼上说的对，util._extend方法内部实现用了Object.keys方法，看看他的文档：
The Object.keys() method returns an array of a given object's own enumerable properties, in the same order as that provided by a for...in loop (the difference being that a for-in loop enumerates properties in the prototype chain as well).
这个方法并不会返回对象原型链上的属性，over！
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