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                            ### 數據結構
![](https://box.kancloud.cn/726c19224c29edaa5f22ed3b04bd456c_799x452.png)

集合間API

![](https://box.kancloud.cn/769d050dde2d364739ef84f00a90af21_909x504.png)



### 特點
1. 無序,無法按索引取出元素;
2. 無重復;
3. 集合間操作 : 差集,交集,并集;




### 注意
1. 使用smembers 每次得到的數據是無序的;
2. 使用smembers 是獲取所有數據, 如果數據量大的話.可能造成阻塞;
3. spop從集合彈出元素 ;
4. srandmember不會破壞集合 ;


### 使用場景
1. 抽獎;
2. 點贊;
3. 標簽;
4. 共同關注;


SADD = Tagging	//標簽相關
SPOP/SRANDMEMBERS = Randdom item 	//隨機數相關
SADD + SINTER = Social GRAPH  //社交相關



                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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