简单的写法
redis.defineCommand('echoDynamicKeyNumber', {
lua: 'return {KEYS[1],KEYS[2],ARGV[1],ARGV[2]}'
});
// Now you have to pass the number of keys as the first argument every time
// you invoke the `echoDynamicKeyNumber` command:
redis.echoDynamicKeyNumber(2, 'k1', 'k2', 'a1', 'a2', function (err, result) {
// result === ['k1', 'k2', 'a1', 'a2']
var sss=result;
});
