PHP HTML entiy functions (`htmlentities()` & `html_entity_decode()`) in jQuery

jquery-htmlentities.js

$.htmlentities = {
  /**
   * Converts a string to its html characters completely.
   * It's equivalent to htmlentities() in PHP
   * Reference: https://css-tricks.com/snippets/javascript/htmlentities-for-javascript/
   *
   * @param {String} str String with unescaped HTML characters
   **/
  encode (str) {
    return String(str).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
  },
  /**
   * Converts an html characterSet into its original character.
   * It's equivalent to html_entity_decode() in PHP
   * Reference: https://stackoverflow.com/questions/5796718/html-entity-decode
   *
   * @param {string}
   * @return {string}
   **/
  decode: (() => {
    // this prevents any overhead from creating the object each time
    let element = document.createElement('div');

    function decodeHTMLEntities(str) {
      if (str && typeof str === 'string') {
        // strip script/html tags
        str = str.replace(/<script[^>]*>([\S\s]*?)<\/script>/gmi, '');
        str = str.replace(/<\/?\w(?:[^"'>]|"[^"]*"|'[^']*')*>/gmi, '');
        element.innerHTML = str;
        str = element.textContent;
        element.textContent = '';
      }

      return str;
    }

    return decodeHTMLEntities;
  })()
};

I found this function, but how does it work?
thanks by advance

I found this function, but how does it work?
thanks by advance

Hello, this function is easy to use, it required you included jquery first. Then put this function in, and it will work.

I can give you some examples:

$.htmlentities.encode('<h1>Hello</h1>');    // result: "&lt;h1&gt;Hello&lt;/h1&gt;"
$.htmlentities.decode("&lt;h1&gt;Hello&lt;/h1&gt;");    // result: "<h1>Hello</h1>"