input限制只能输入正整数，并能通过el-form表单验证

<template>
  <el-form ref="ruleForm" :model="ruleForm" :rules="rules" label-width="100px">
    <el-form-item label="优惠券金额" prop="discount_amount">
      <el-input 
        v-model="ruleForm.discount_amount" 
        @input="handleInput"
        placeholder="请输入正整数"
      ></el-input>
    </el-form-item>
    <el-form-item>
      <el-button type="primary" @click="submitForm">提交</el-button>
    </el-form-item>
  </el-form>
</template>

<script>
export default {
  data() {
    return {
      ruleForm: {
        discount_amount: "",
      },
      rules: {
        discount_amount: [
          { required: true, message: "请输入优惠券金额", trigger: "blur" },
        ],
      },
    };
  },
  methods: {
    handleInput() {
      this.ruleForm.discount_amount = this.ruleForm.discount_amount
        .replace(/\D/g, "") // 只允许输入数字
        .replace(/^0+/, ""); // 禁止输入前导0
    },
    submitForm() {
      this.$refs.ruleForm.validate((valid) => {
        if (valid) {
          alert("提交成功！");
        } else {
          console.log("表单验证失败");
          return false;
        }
      });
    },
  },
};
</script>