发布为微信小程序之后报错

VM17 WAService.js:2 ReferenceError: _ is not defined
at u.nonEmptycheck (login.js? [sm]:1)
at u.goLogin (login.js? [sm]:1)
at vendor.js? [sm]:15
at Array.forEach (<anonymous>)
at vendor.js? [sm]:15
at Array.forEach (<anonymous>)
at Vo.bn [as __e] (vendor.js? [sm]:15)
at Vo.<anonymous> (VM17 WAService.js:2)
at o.safeCallback (VM17 WAService.js:2)
at o.call (VM17 WAService.js:2)(env: Windows,mp,1.05.2107090; lib: 2.18.1)

页面代码就一个工具函数，函数名为 xxx_sss_ddd