用于判断对象是否为Array的JavaScript方式

Question

判断对象是否为数组的"正确"方法是什么？

function isArray(o){??? }

Answer 1

The best way:

function isArray(obj) {
  return Object.prototype.toString.call(obj) == '[object Array]';
}

The ECMAScript 5th Edition Specification defines a method for that, and some browsers, like Firefox 3.7alpha, Chrome 5 Beta, and latest WebKit Nightly builds already provide a native implementation, so you might want to implement it if not available:

if (typeof Array.isArray != 'function') {
  Array.isArray = function (obj) {
    return Object.prototype.toString.call(obj) == '[object Array]';
  };
}