The difference between == and === in vue

The equality operators == and === in Vue.js have the following differences: Loose equality (==): perform type conversion and compare values ​​for equality. Strict equality (===): No type conversion is performed, and the value type and value are compared exactly for equality.

The difference between == and === in Vue.js

== and === are Vue Two equality operators in .js that have different behaviors when comparing values.

== (Loose equality)

• Compares two values ​​for equality, following the loose equality rules in the JavaScript language.
• Automatically convert values ​​to the same type for comparison.
• For example:

<code class="js">1 == '1' // true
null == undefined // true
[] == false // true</code>

=== (strict equality)

• Strictly compare two values ​​​​to see if they are equal, do not proceed Type conversion.
• Return true only if the two value types are the same and equal.
• For example:

<code class="js">1 === '1' // false
null === undefined // false
[] === false // false</code>

Usage scenarios

• ##Loose equality (==) :

  Ignore type differences when it is necessary to check whether two values ​​have the same value.
  • Typically used for data checking or comparison with user input.

• Strict Equality (===):

  Include types when two values ​​need to be compared exactly.
  • Used for strict comparison of objects or arrays to ensure data consistency.

Note:

In the Vue.js template, when using instructions such as v-if, it is recommended to use strict equality (= ==) operator. This helps prevent accidental type conversions and incorrect comparison results.

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