elementUI el-input金额必填校验

<template>
  <el-form :model="form" :rules="rules" ref="amountForm">
    <el-form-item label="金额" prop="amount">
      <el-input v-model.number="form.amount"></el-input>
    </el-form-item>
    <el-button type="primary" @click="submitForm">提交</el-button>
  </el-form>
</template>
 
<script>
  export default {
    data() {
      return {
        form: {
          amount: ''
        },
        rules: {
          amount: [
            { required: true, message: '请输入金额', trigger: 'blur' },
            {
              validator: (rule, value, callback) => {
                if (!value) {
                  return callback();
                }
                if (!/^(\d+|\d+.\d{1,2})$/.test(value)) {
                  callback(new Error('请输入正确的金额格式'));
                } else {
                  callback();
                }
              },
              trigger: 'blur'
            }
          ]
        }
      };
    },
    methods: {
      submitForm() {
        this.$refs.amountForm.validate(valid => {
          if (valid) {
            alert('验证通过');
          } else {
            console.log('验证失败');
            return false;
          }
        });
      }
    }
  };
</script>