List built in JavaScript standard object methods

问题

Is there a way to list all JavaScript standard object method?

I mean I'm trying to get all the built in methods of String so I was thinking and I did tried doing this:

for( var method in String ) {
    console.log( method );
}

// I also tried this:
for( var method in String.prototype ) {
    console.log( method );
}

But no luck. Also if there is a way that solution should work for all ECMAScript standard classes/objects.

Edit: I want to point out that the solution should work in server side environment also like rhino or node.js.

And as much as possible not using a third party API/framework.

回答1:

Won't dir give you what you need?

console.log(dir(method))

EDIT:

This would work (try John Resig's Blog for more info):

Object.getOwnPropertyNames(Object.prototype) gives :

["constructor", "toString", "toLocaleString", "valueOf", "hasOwnProperty", "isPrototypeOf", "propertyIsEnumerable", "__defineGetter__", "__lookupGetter__", "__defineSetter__", "__lookupSetter__"]

Object.getOwnPropertyNames(Object) gives :

["length", "name", "arguments", "caller", "prototype", "keys", "create", "defineProperty", "defineProperties", "freeze", "getPrototypeOf", "getOwnPropertyDescriptor", "getOwnPropertyNames", "is", "isExtensible", "isFrozen", "isSealed", "preventExtensions", "seal"]

回答2:

You should be able to get the list of methods by checking the type of properties as explained here

Also try getOwnPropertyNames

回答3:

I got the answer from this post How to display all methods of an object in Javascript?

Thanks to CiannanSims

回答4:

So here is a way to squeeze out a few more properties:

> function a () {}
undefined
> Object.getOwnPropertyNames(a)
[ 'length',
  'name',
  'arguments',
  'caller',
  'prototype' ]
> a.bind
[Function: bind]
> // Oops, I wanted that aswell
undefined
> Object.getOwnPropertyNames(Object.getPrototypeOf(a))
[ 'length',
  'name',
  'arguments',
  'caller',
  'constructor',
  'bind',
  'toString',
  'call',
  'apply' ]

I am not a javascript person but I would guess that the reason that this happens is because bind, toString, call and apply might be inherited from higher inheritance levels (does that even make sense in this context?)

EDIT: Btw here is one i implemented that looks as far back in the prototypes as it can.

function getAttrs(obj) {
    var ret = Object.getOwnPropertyNames(obj);
    while (true) {
        obj = Object.getPrototypeOf(obj);
        try {
            var arr = Object.getOwnPropertyNames(obj);
        } catch (e) {
            break;
        }

        for (var i=0; i<arr.length; i++) {
            if (ret.indexOf(arr[i]) == -1)
                ret.push(arr[i]);
        }
    }

    return ret;
}

来源：https://stackoverflow.com/questions/15696958/list-built-in-javascript-standard-object-methods

标签

javascript

node.js

rhino