e.substr is not a function
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请具体描述问题
我要在wxs里 把['广东', '汕头', '地方'] 转为字符串'广东，汕头，地方'
我发现split也用不了 苍天啊
wxs中，各数据类型支持的方法请参考文档说明：https://developers.weixin.qq.com/miniprogram/dev/reference/wxs/06datatype.html