object is

This method was introduced in ES2015. It aims to help comparing values.

ES2015中引入了此方法。 它旨在帮助比较价值。

Usage:

用法：

Object.is(a, b)

The result is always false unless:

结果始终为false除非：

• a and b are the same exact object

  a和b是相同的精确对象

• a and b are equal strings (strings are equal when composed by the same characters, in the same order)

  a和b是相等的字符串(当由相同的字符以相同的顺序组成时，字符串是相等的)

• a and b are equal numbers (numbers are equal when their value is equal)

  a和b是相等的数字(数值相等时数字相等)

• a and b are both undefined, both null, both NaN, both true or both false

  a和b都undefined ，都为null ，都为NaN ，都为true或均为false

0 and -0 are different values in JavaScript, so pay attention in this special case (convert all to +0 using the + unary operator before comparing, for example).

0和-0是JavaScript中的不同值，因此请注意这种特殊情况(例如，在进行比较之前，使用+一元运算符将所有值转换为+0 )。

翻译自:

object is