JavaScript 的HTML转义方法 html_encode 和 html_decode

function html_encode(str)
{
  var s = "";
  if (str.length == 0) return "";
  s = str.replace(/&/g, ">");
  s = s.replace(/</g, "<");
  s = s.replace(/>/g, ">");
  s = s.replace(/ /g, " ");
  s = s.replace(/\‘/g, "‘");
  s = s.replace(/\"/g, """);
  s = s.replace(/\n/g, "<br>");
  return s;
}

function html_decode(str)
{
  var s = "";
  if (str.length == 0) return "";
  s = str.replace(/>/g, "&");
  s = s.replace(/</g, "<");
  s = s.replace(/>/g, ">");
  s = s.replace(/ /g, " ");
  s = s.replace(/‘/g, "\‘");
  s = s.replace(/"/g, "\"");
  s = s.replace(/<br>/g, "\n");
  return s;
}