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                            DOM中的范圍

    createRange()
    hasFeature()
    
    var supportsRange = document.implementation.hsaFeature("Range","2.0")
    var alsoSupportsRange = (typeof document.createRange == "function");
    
     var rang = document.createRange();
    
    每個范圍有一個range類型的實例表示，這個實例擁有很多方法和屬性。
    startContainer
    startOffset
    endContainer
    endOffset

1、DOM范圍實現簡單選擇
    
    selectNode()
    selectNodeContents()
    
    setStartBefore()
    setStartAfter()
    setEndBefore()
    setEndAfter()
    
2、DOM范圍實現復雜選擇

    setStart()
    setEnd()
    
3、操作DOM范圍中的內容(文檔片段)

    deleteContents()
    extractContents()
    cloneContents()
    
4、插入DOM范圍中的內容

    insertNode()
    
5、折疊DOM范圍
    
    collapse()
    collapsed屬性
    
6、比較DOM范圍

    compareBoundaryPoints()
    
7、復制DOM范圍

    cloneRange()
    
8、清理DOM范圍

    deatch()
    

    
    
    
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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