What do the three equal signs mean in Vue?

The three equal signs (===) in Vue.js are strict equality operators, ensuring that values ​​and data types are equal and return true. It is used for exact comparisons, preventing type conversion errors, especially when comparing Boolean values, reference types and avoiding type conversion errors.

The meaning of three equal signs (===) in Vue.js

In Vue.js , triple equal signs (===) is a strict equality operator, which means that it not only checks whether two values ​​are equal, but also checks whether their data types are the same.

Purpose

Three equal signs are used to compare two values, and it will return true if and only if their values ​​and data types are equal. Unlike two equal signs (==), it does not perform a type conversion, ensuring a more accurate comparison.

Syntax

<code>if (a === b) {
  // a 和 b 严格相等
}</code>

Example

<code>const a = 1;
const b = "1";

console.log(a === b); // 输出 false</code>

In the above example, a is a number and b is a string . Although they have the same value, they are of different types, so the three equals operations return false.

Advantages

The main advantage of using three equal signs is that it provides a more rigorous and accurate comparison. By ensuring that both values ​​and data types are equal, it prevents errors caused by unexpected type conversions.

Note

In Vue.js, using three equal signs is important for certain use cases, for example:

• Comparing booleans Value (true === true)
• Compare reference types ([1, 2] === [1, 2])
• Avoid type conversion errors

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