[Solved] Element form method Error: TypeError: Cannot read properties of undefined (reading ‘resetFields’)

use:

      /**
       * rebuild sheet
       */
      resetForm(formName){
          this.$refs[formName].resetFields();
      },

report errors:

TypeError: Cannot read properties of undefined (reading 'resetFields')
    at VueComponent.resetForm (index.vue?6ced:501)
    at VueComponent.addColumn (index.vue?6ced:487)
    at click (index.vue?5d22:653)
    at invokeWithErrorHandling (vue.runtime.esm.js?2b0e:1854)
    at VueComponent.invoker (vue.runtime.esm.js?2b0e:2179)
    at invokeWithErrorHandling (vue.runtime.esm.js?2b0e:1854)
    at VueComponent.Vue.$emit (vue.runtime.esm.js?2b0e:3888)
    at VueComponent.handleClick (element-ui.common.js?5c96:9441)
    at invokeWithErrorHandling (vue.runtime.esm.js?2b0e:1854)
    at HTMLButtonElement.invoker (vue.runtime.esm.js?2b0e:2179)

Solution:

      /**
       * rebuild sheet
       */
      resetForm(formName) {
        //The purpose of adding if judgment condition is to solve the problem that the console prompt object does not exist
        if (this.$refs[formName] !== undefined) {
          this.$refs[formName].resetFields();
        }
      },