Detailed explanation of the difference between == and === in js

In order to reduce conceptual confusion, = should be called (get or assign), == should be called (equal), === should be called (strict equal)

Same points:

Both of their operators allow operands of any type. If the operands are equal, return true, otherwise return false

Different:

==: The operator is called equality, used To detect whether two operands are equal. The definition of equality here is very loose and can allow 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, == compares the "value converted to the same type" to see whether the "values" are equal, = ==If the types are different, the result will be unequal

Same type comparison, direct "value" comparison, the result will be the same

2. For advanced types such as Array, Object, == There is no difference between === and ===

3. Basic types and advanced types, there is a difference between == and ===

For ==, convert the advanced type into a basic type and perform "Value" comparison

Because the types are different, the === result is false

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