gistfile1.txt

  /*  
     XPath utility
      usage: var results= x$('//div');
             x$('//div').each(function() {
                ...
             });
   */
  function $x(exp, obj) {
    var target = obj || document;
    
    var r =  document.evaluate(exp, target, null, 7, null);
    
    // 配列に"each"を追加　これはちょっと危ないか？
    if (!("each" in Array.prototype)) {
      Array.prototype.each = function(fnc) {
        for(var i = 0; i < this.length; i++) {
          fnc(this[i]);
        }
      }
    }
    
    // 独自拡張版配列に詰めて返す
    var result = new Array();
    for (var i = 0; i < r.snapshotLength; i++ ) {
      result.push(r.snapshotItem(i));
    }
    return result;
  }