How to use the Object.is() method in JavaScript? (code example)

In JavaScript, the Object.is() method can be used to determine whether two values ​​are the same. The following article will introduce to you how to use the JavaScript Object.is() method and understand the difference between the Object.is() method and the == operator. I hope it will be helpful to you. [Video tutorial recommendation: JavaScript tutorial]

JavaScript Object.is() method

The Object.is() method is used to determine whether two values ​​are the same; it accepts two parameters, which are the values ​​to be compared, and returns a Boolean value indicating whether the two parameters are the same. Syntax:

Object.is(value1, value2)

Two values ​​can be the same if they have one of the following properties:

●If both values ​​are undefined .

●　If both values ​​are null.

●　If both values ​​are true or false.

●　If two strings have the same length, the same characters and the same order.

●　If both values ​​are numbers and both are "0".

●　If both values ​​are numbers and both are "-0".

●　If both values ​​are numbers and both are "NaN"; or neither is NaN, both are non-zero, and both have the same value.

Object.is() method can be applied to:

●Object.is() is used to compare two strings.

●Object.is() is used to compare two numbers.

●Object.is() is used to compare two objects.

Example 1:

Object.is('PHP中文网', 'PHP中文网');

Output:

Example 2:

Object.is(0,-0);

Output:

Difference between Object.is() method and "==" operator

1. The "==" and "===" operators treat the numeric values ​​"0" and "-0" as equal, while the Object.is() method treats them as equal. is not equal to.

2. If both values ​​are numbers and both are "NaN", the "==" and "===" operators will not treat them as equal; and the Object.is() method are considered equal.

var a=NaN;
var b=NaN;
console.log(a==b);

Output:

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