sanitize.js

/**
 * Sanitizing string value.
 * 
 * @require jQuery
 */
(function($) {
  var $div = $('<div/>');
  String.prototype.sanitize = function() {
    return $div.text(this)[0].innerHTML;                                                                                                                                               
  };
}) (jQuery);

/*
 * var html = '<script>alert("hello");</script>';
 * html.sanitize(); // === "&lt;script&gt;alert("hello");&lt;/script&gt;"
 *
 */