方法

          getElementsByName()                   获取name

          getElementsByTagName()              获取元素

          getAttribute()                                获取元素属性

          setAttribute()                                设置元素属性

          childNodes()                                  访问子节点

          parentNode()                                 访问父节点

          createElement()                             创建元素节点

          createTextNode                              创建文本节点 

           insertBefore()                                插入节点

           removeChild()                                删除节点

           offsetHeight(不包含滚动条)                                   网页尺寸

           scrollHeight(包含滚动条)                                    网页尺寸

javascript DOM对象控制HTML元素详解