code: function escapeHtml(s) {
              if (_toString.call(s) != "[object String]") return s;
              if (!s) return "";
              return s.replace(/[\<\>\&\"]/gm, function (match) {
                  switch (match) {
                      case "<":
                          return "&lt;";
                      case ">":
                          return "&gt;";
                      case "&":
                          return "&amp;";
                      case "\"":
                          return "&quot;";
                      default:
                          return match;
                  }
              });
          }
docs: HTML 문자열을 escape 처리합니다.
  "&lt;" represents the < sign.
  "&gt;" represents the > sign.
  "&amp;" represents the & sign.
  "&quot; represents the " mark.
  [Character entity references](https://www.w3.org/TR/html401/charset.html#h-5.3)
  @method ax5.util.escapeHtml
  @param {String} s
  @returns {string}
  @example
  ```
  ax5.util.escapeHtml('HTML <span>string</span> & "escape"')
  //"HTML &lt;span&gt;string&lt;/span&gt; &amp; &quot;escape&quot;"
  ```