js 获取子节点函数 (兼容FF与IE)

代码如下:function getFirstChild(obj) { var result = obj.firstChild; while (!result.tagName) { result = result.nextSibling; } return result; } function getNextChild(obj) { var result = obj.nextSibling; while (!result.tagName) { result = result.nextSibling; } return result; }