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原有逻辑:每次获取所有的tick数据。缺点:在行情实时判断时需要等待较长时间,延迟太大
新的逻辑:增加默认参数all=True。优点:不影响原有接口。当传人all=False时,只获取第一页数据。通过裁剪内容,提高了接口响应速度。