子组件：

    <el-form :model="ruleForm" status-icon :rules="rules" ref="ruleForm" label-width="100px" class="demo-ruleForm">
      <el-form-item label="密码" prop="pass">
        <el-input type="password" v-model="ruleForm.pass" autocomplete="off"></el-input>
      </el-form-item>
      <el-form-item label="确认密码" prop="checkPass">
        <el-input type="password" v-model="ruleForm.checkPass" autocomplete="off"></el-input>
      </el-form-item>
      <el-form-item label="年龄" prop="age">
        <el-input v-model.number="ruleForm.age"></el-input>
      </el-form-item>
    </el-form>
    
    <script>
      export default {
        props: {
            propsRuleForm: Object
        },
        data() {
          var checkAge = (rule, value, callback) => {
            if (!value) {
              return callback(new Error('年龄不能为空'));
            }
            setTimeout(() => {
              if (!Number.isInteger(value)) {
                callback(new Error('请输入数字值'));
              } else {
                if (value < 18) {
                  callback(new Error('必须年满18岁'));
                } else {
                  callback();
                }
              }
            }, 1000);
          };
          var validatePass = (rule, value, callback) => {
            if (value === '') {
              callback(new Error('请输入密码'));
            } else {
              if (this.ruleForm.checkPass !== '') {
                this.$refs.ruleForm.validateField('checkPass');
              }
              callback();
            }
          };
          var validatePass2 = (rule, value, callback) => {
            if (value === '') {
              callback(new Error('请再次输入密码'));
            } else if (value !== this.ruleForm.pass) {
              callback(new Error('两次输入密码不一致!'));
            } else {
              callback();
            }
          };
          return {
            ruleForm: this.propsRuleForm,
            rules: {
              pass: [
                { validator: validatePass, trigger: 'blur' }
              ],
              checkPass: [
                { validator: validatePass2, trigger: 'blur' }
              ],
              age: [
                { validator: checkAge, trigger: 'blur' }
              ]
            }
          };
        },
        methods: {
          submitForm(formName) {
            this.$refs[formName].validate((valid) => {
              if (valid) {
                alert('submit!');
              } else {
                console.log('error submit!!');
                return false;
              }
            });
          },
          resetForm(formName) {
            this.$refs[formName].resetFields();
          }
        }
      }
    </script>
    
    
    

父组件：

<template>
    <el-button @click="submit">提交</el-buttom>
    <div v-for="(item, index) in List" :key="index">
        <子组件 @propsRuleForm="item" />
    </div>
</template>
<script>
    import 子组件 form './子组件.vue'
     export default {
         data () {
             List: [
                { pass: '', checkPass: '', age: '1' },
                { pass: '', checkPass: '', age: '2'}
             ]
         },
         methods: {
             submit () {
                 // 求校验所有form的方法，如果通过执行下一步，如果不通过提示哪个form验证不通过
             }
         }
     }
</script>

求校验所有form的方法，如果通过执行下一步，如果不通过提示哪个form验证不通过