javascript plus sign escape

The plus sign " " in JavaScript can be used as both a mathematical operator and a string concatenator.

When the plus sign is used as a mathematical operator, it adds two numbers, as shown below:

const a = 10;
const b = 20;
const result = a + b;
console.log(result); // 30

When the plus sign is used as a string concatenator, it adds two numbers The strings are concatenated together as shown below:

const str1 = 'Hello';
const str2 = 'World';
const result = str1 + str2;
console.log(result); // HelloWorld

Sometimes, we need to use the plus sign as a string concatenator, but the string may also contain the plus sign character. At this time, you need to escape the plus sign.

In JavaScript, use backslash "" to escape characters. So when we need to display the plus sign in a string, we can use " " to escape.

For example:

const str = 'JavaScript+加号';
console.log(str); // JavaScript+加号

In the above example, we used " " in the string "JavaScript plus sign" to escape, so the output result is "JavaScript plus sign" Number".

It should be noted that when using backslash to escape, the backslash itself also needs to be escaped, otherwise it will be regarded as a special character in the string. For example, if we need to display the backslash character "" in a string, then we need to escape it using "\".

For example:

const str = 'JavaScript中的\反斜杠';
console.log(str); // JavaScript中的反斜杠

In the above example, we used "\" in the string "backslash in JavaScript" to escape, so the output result for "Backslash in JavaScript".

In short, escaping is one of the commonly used operations in JavaScript, which allows us to display various special characters in strings. Among them, using " " to escape the plus sign character allows us to display the plus sign and other content in the string at the same time, which is very convenient.

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