JavaScript类似PHP中implode的函数

function implode (glue, pieces) {
  // From: http://phpjs.org/functions
  // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   improved by: Waldo Malqui Silva
  // +   improved by: Itsacon (http://www.itsacon.net/)
  // +   bugfixed by: Brett Zamir (http://brett-zamir.me)
  // *     example 1: implode(' ', ['Kevin', 'van', 'Zonneveld']);
  // *     returns 1: 'Kevin van Zonneveld'
  // *     example 2: implode(' ', {first:'Kevin', last: 'van Zonneveld'});
  // *     returns 2: 'Kevin van Zonneveld'
  var i = '',
    retVal = '',
    tGlue = '';
  if (arguments.length === 1) {
    pieces = glue;
    glue = '';
  }
  if (typeof pieces === 'object') {
    if (Object.prototype.toString.call(pieces) === '[object Array]') {
      return pieces.join(glue);
    }
    for (i in pieces) {
      retVal += tGlue + pieces[i];
      tGlue = glue;
    }
    return retVal;
  }
  return pieces;
}