Cannot read properties of undefined (reading 'indexOf')
at VueComponent.resetField (index.js:1:370572)
at VueComponent.resetField (index.js:1:370572)
elementUI源码报错，原因竟然是form-item没加prop，折腾了一两个小时，真是服了。
rules按照表单的prop来的 用了那个resetfieds必须每个<el-form-item>都加prop！！
因为最后这个表单是个纯展示的所以没有写prop，结果就在关闭弹窗的方法里调用了this.$refs["addForm"].resetFields();一直报错！！！！真坑！！
表单重置 this.$refs.form.resetFields() 也需要 el-form-item 绑定 prop， 否则无效
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