第一种:"errno":5,"errMsg":"request:fail fai",
第二种:"errno":600001,"errMsg":"request:fail -103:net::ERR_CONNECTION_ABORTED
第三种:"errno":600001,"errMsg":"request:fail -118:net::ERR_CONNECTION_TIMED_OUT"
第四种:"errno":600001,"errMsg":"request:fail -7:net::ERR_TIMED_OUT"