使用wepy开发小程序，在用vant框架datetime-picker组件中,一直报formatter is not a function,第一次进入页面的时候是正常，后面重新进入页面，就会一直报这个错，导致控件无法正常使用
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请具体描述问题出现的流程，并提供能复现问题的简单代码片段（https://developers.weixin.qq.com/miniprogram/dev/devtools/minicode.html）。
你的方法写到 data ？