sismember
1. 基本語法
sismember(key, value , callback)
key, value , callback) 2. 範例
const arr1 = ['A', 'B', 'C'];
client.sadd('user:1:choice', arr1);
client.sismember('user:1:choice','A', redis.print);
client.sismember('user:1:choice','D', redis.print);Reply: 1
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