Let’s talk about some commonly used HTML and JavaScript escape characters

In web development, we often need to display special characters in HTML pages, such as quotation marks, less than or greater than signs, slashes, etc. If these characters are placed directly into HTML code, they may be parsed by the browser as special HTML tags or attributes, causing problems on the page. Therefore, we need to escape these special characters to avoid unnecessary errors.

The escape character is a sequence composed of two characters. The first character is the backslash "\", and the second character is the character that needs to be escaped. For example, we can use the "\" character to escape double quotes, that is, "\" and """ form a sequence "\". In this way, double quotes can be displayed correctly in HTML pages.

In JavaScript, we also need to escape special characters to avoid unexpected errors. For example, we cannot use newlines or carriage returns directly in strings, otherwise it will cause syntax errors. We need to use escapes The character "\n" represents a newline character, and "\r" is used to represent a carriage return character.

Let's introduce some commonly used HTML and JavaScript escape characters:

HTML escape Characters:

1. Less than sign (<): Use "<" or "<".
2. Greater than sign (>): Use ">" or "> " means.
3. Space ( ): means " " or " ".
4. Quotation marks ("): means """ or """.
5. Single quotation mark ('): expressed with "'" or "'".
6. Copyright symbol (©): represented by “©” or “©”.
7. Registered trademark symbol (®): represented by “®” or “®”.
8. Trademark symbol (™): represented by “™” or “™”.

JavaScript escape characters:

1. Backslash (\): represented by "\".
2. Single quotation mark ('): represented by "\'".
3. Double quotes ("): expressed by "\"".
4. Line break (\n): represented by "\n".
5. Carriage return character (\r): represented by "\r".
6. Tab character (\t): represented by "\t".

In actual development, we often use JavaScript to dynamically insert HTML content into the page. At this time, we not only need to escape the HTML content, but also need to escape the JavaScript string to avoid syntax errors caused by special characters.

In addition to manually escaping special characters, we can also use some libraries to automatically escape HTML and JavaScript. Among them, the more popular libraries include jQuery and Lodash.

When using these libraries, we should pay attention to using corresponding methods when inserting escaped content into HTML pages or JavaScript code. For example, use jQuery's "text()" method to insert content into an HTML text node, and use the "html()" method to insert content into an HTML node.

In short, escape characters are essential whether in HTML or JavaScript. We should be proficient in the use of various escape characters to avoid unnecessary errors during development.

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