给html元素对象加一个只读属性

<sript type="text/javascript">
  <!--
    if(HTMLElement) {
       HTMLElemen.tprototype._defineGetter_("childNodeDetail", function() {
    var result = (elementNodes:0, textNodes:0 )   
    for (var i = 0; i < this.childNodes.length; i++) {
       switch (this.childNodes[i].nodeType) {
        case 1:;
        result.elementNodes++;
        break;
        case 3;
        result.textNodes++;
        break;
       }
    }
    return result;
    }

  -->
</script>