求相似demo
https://www.baidu.com/link?url=bEAE-G9YVgMXxidQ5cUCZaPJEO5lrlGA27EuoTfVQ37n8XcnbirPm9HJv4tDkoFp96WdqoTtjH51as7g5FF4Cq&wd=&eqid=b03b83ae00026ae8000000055b2e6e36
