ReferenceError: key is not defined

    at Vo.signHmacSha1 (index.js? [sm]:66)

    at Vo.initMqttOptions (index.js? [sm]:52)

    at Vo.doConnect (index.js? [sm]:17)

    at Vo.onLoad (index.js? [sm]:8)

    at Vo.<anonymous> (VM977 WAService.js:2)

    at Vo.a.__callPageLifeTime__ (VM977 WAService.js:2)

    at un (VM977 WAService.js:2)

    at VM977 WAService.js:2

    at gn (VM977 WAService.js:2)

    at r.<anonymous> (VM977 WAService.js:2)(env: Windows,mp,1.05.2201240; lib: 2.19.4)