复选框组件报错

thirdScriptError

Cannot read property ‘length’ of undefined;at pages/index/ticketResult/ticketResult page checkboxChange function

TypeError: Cannot read property ‘length’ of undefined

   at e.checkboxChange (http://127.0.0.1:9973/appservice/pages/index/ticketResult/ticketResult.js:165:33)

   at e.

(http://127.0.0.1:9973/appservice/__dev__/WAService.js:10:25676)

   at e.a (http://127.0.0.1:9973/appservice/\_\_dev\_\_/WAService.js:10:20563)

   at N (http://127.0.0.1:9973/appservice/\_\_dev\_\_/WAService.js:10:15725)

   at Function.

(http://127.0.0.1:9973/appservice/__dev__/WAService.js:10:17280)

   at http://127.0.0.1:9973/appservice/\_\_dev\_\_/WAService.js:10:22066

   at http://127.0.0.1:9973/appservice/\_\_dev\_\_/WAService.js:6:3377

   at e.(anonymous function) (http://127.0.0.1:9973/appservice/\_\_dev\_\_/WAService.js:3:28449)

   at d (http://127.0.0.1:9973/appservice/appservice:1128:8907)

   at g.registerCallback (http://127.0.0.1:9973/appservice/appservice:1128:9087)