Javascript String safeEscape()

/**/*from  w  w w  .ja  va  2s  . co  m*/
convert 8 bit characters to their 7 bit equivalent
@function
*/
String.prototype.safeEscape = function() {
 var str = $.trim(this),
 replacements = {
  "\xa0": " ", "\xb7": "*", "\u2018": "'", "\u2019": "'", "\u2026": "...", "\u2002": " ", "\u2003": " ", "\u2009": " ", "\u2012": "-", "\u2013": "-", "\u2014": "-", "\u2015": "-",
  "\u201c": '"', // smart quote
  "\u201d": '"' // smart quote
 };

 for (key in replacements)
  str = str.replace(new RegExp(key, 'g'), replacements[key]);

 return encodeURIComponent(str).replace(/%20/g, '+').toString();
};