去看一下表單驗證的代碼，找到這一句：
this.$refs[formName].validate((valid) => {
看看這里refs的值與el-form上綁定的ref值一直不一致，注意：把refs和ref名字保持一致就行了
VUE表單驗證報錯：Error in v-on handler: "TypeError: Cannot read property 'validate' of undefined"解決
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