去看一下表单验证的代码，找到这一句：
this.$refs[formName].validate((valid) => {
看看这里refs的值与el-form上绑定的ref值一直不一致，注意：把refs和ref名字保持一致就行了
VUE表单验证报错：Error in v-on handler: "TypeError: Cannot read property 'validate' of undefined"解决
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