检查该值是否为对象字面值？ [英] Check that value is object literal?

问题描述

我有一个值，想要知道它是否是一个可迭代的对象文字，然后再迭代它。

I have a value and want to know if it's an iteratable object literal, before I iterate it.

我该怎么做？

推荐答案

这应该适合你：

if( Object.prototype.toString.call( someObject ) === '[object Object]' ) {
    // do your iteration
}

来自 ECMAScript 5第8.6.2节如果您有兴趣：

[[Class]]内部属性的值由此规范为每种内置对象定义。主机对象的[[Class]]内部属性的值可以是除Arguments，Array，Boolean，Date，Error，Function，JSON之一之外的任何String值。 ，数学，数字，对象，RegExp和字符串。内部使用[[Class]]内部属性的值来区分不同类型的对象。请注意，除了通过Object.prototype.toString（参见15.2.4.2）之外，本规范没有为程序提供访问该值的任何方法。

The value of the [[Class]] internal property is defined by this specification for every kind of built-in object. The value of the [[Class]] internal property of a host object may be any String value except one of "Arguments", "Array", "Boolean", "Date", "Error", "Function", "JSON", "Math", "Number", "Object", "RegExp", and "String". The value of a [[Class]] internal property is used internally to distinguish different kinds of objects. Note that this specification does not provide any means for a program to access that value except through Object.prototype.toString (see 15.2.4.2).

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