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                            ### DOM 節點

- DOM 節點
  - 獲取子節點
    - `childNodes`：不兼容高版本，用`nodeType` 兼容
      - 獲取文本節點`( nodeType == 3)` 和元素節點`( nodeType == 1)`
    - `children`：**只獲取元素節點，兼容**
  - `parentNode`：查找父節點
    - 例子：點擊鏈接，隱藏整個 `li`
  - `offsetParent`：查找定位父級
    - 例子：獲取元素在頁面上的實際位置
  - 首尾子節點
    - `firstChild`  有兼容性問題，IE6-8用
    - `firstElementChild` 高版本使用
    - `lastChild `/ `lastElementChild` 
  - 兄弟節點
    - 有兼容性問題，IE6-8用前面的
    - `nextSbling` / ` nextElementSibling`
    - `previousSibling  `  /  `previousElementSibling`
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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