获得JavaScript的阵列的方法列表 [英] get list of methods in JavaScript's Array

问题描述

var c=$('<canvas></canvas>')[0].getContext('2d')
for(m in c){console.log(m)}

本打印的CanvasRenderingContext2D方法的列表。我该怎么办了一个数组一样。我想要得到拼接，流行，推等。显然为（以Array.prototype米）{执行console.log（M）} 荣获'将不起作用。

This prints a list of methods in CanvasRenderingContext2D. How can I do the same for an Array. I want to get "splice", "pop", "push", etc. Obviously for(m in Array.prototype){console.log(m)} won't work.

推荐答案

大多数方法和内置对象内部被标记为不可枚举的，所以他们不会在一个枚举的属性用户资格在循环。

Most methods and properties of built-in objects are internally marked as non-enumerable, so they will not be enumerated in a for-in loop.

5的ECMAScript有<一个href=\"https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames\"><$c$c>Object.getOwnPropertyNames方法，返回所有属性名的数组，所以你可以这样做：

ECMAScript 5 has an Object.getOwnPropertyNames method that returns an array of all property names, so you can do:

Object.getOwnPropertyNames(Array.prototype)

但并不是所有浏览器都支持呢。

but this isn't supported by all browsers yet.

这篇关于获得JavaScript的阵列的方法列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！