JavaScript has three equal signs

summer · Posted on 2/17/2019 3:55:07 PM

=== Used to make strict comparative judgments
Example:

Little scum · Posted on 2/17/2019 7:57:13 PM

learned

==: The operator is called equality, which is used to detect whether two operands are equal, and the definition of equality here is very loose and allows for type conversion
===: Used to detect whether two operands are strictly equal
1. For basic types such as string and number, there is a difference between == and ===
Comparison between different types, the comparison of =="The value after converting to the same type" to see if the "value" is equal, === If the type is different, the result is unequal
For the same type of comparison, directly compare the "value", and the result of both is the same
2. For advanced types such as Array and Object, there is no difference between == and ===
3. There is a difference between basic types and advanced types, == and ===
For == , convert advanced to base type for a "value" comparison because the type is different === results in false

QWERTYU · Posted on 2/18/2019 9:29:03 AM

learned

[JavaScript] JavaScript has three equal signs

Sections viewed