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                            # 順序搜索
* 遍歷數組
* 找到和目標相同元素，返回下標
* 遍歷結束未找到返回-1
* 時間復雜O(n)，就是一個遍歷數組，indexof方法

![](https://img.kancloud.cn/f2/46/f246e02982cc7b211a008c7a98c34e30_1848x1014.png)

# 二分搜索
二分搜索 前提是數組必須是有序的 
* 從數組中間開始尋找
* 比較目標與中間元素大小，大就在大的那一半搜索，小就小的那一搜索
* 每一次搜索范圍縮小都一半 ，所以時間復雜度是O(logn)

![](https://img.kancloud.cn/05/49/0549c54f282860743dbd687aab68acf2_1150x788.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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