vue matches ID card to see if he is an adult

Vue is a popular front-end framework that is often used to develop websites and applications. In actual development, we often need to verify the ID number entered by the user. One of the verifications is to determine whether the user is an adult. This article will introduce how to use Vue to match whether the ID card is an adult.

The ID number consists of 18 digits. The first 17 digits indicate the region and date of birth, and the last digit is the check digit. The format of the date of birth is YYYYMMDD, the year is represented by four digits, and the month and day are represented by two digits. We can determine whether the user has reached adulthood by comparing the date of birth of the ID number with the current date.

In Vue, we can use the computed attribute to calculate the date of birth of the ID number and the current date and compare them. The computed property is a computed property in Vue that can automatically calculate a new value based on the values ​​it depends on.

The following is a simple Vue code example to calculate the date of birth and the current date, and compare whether the two are 18 years or more apart:

<template>
  <div>
    <input v-model="idCardNumber" placeholder="请输入身份证号码">
    <button @click="checkAge">验证</button>
    <p v-if="isAdult">该用户已经成年</p>
    <p v-else>该用户未成年</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      idCardNumber: '',
    }
  },
  computed: {
    birthDate() {
      const year = this.idCardNumber.slice(6, 10)
      const month = this.idCardNumber.slice(10, 12) - 1
      const day = this.idCardNumber.slice(12, 14)
      return new Date(year, month, day)
    },
    currentDate() {
      return new Date()
    },
    isAdult() {
      const yearDiff = this.currentDate.getFullYear() - this.birthDate.getFullYear()
      const monthDiff = this.currentDate.getMonth() - this.birthDate.getMonth()
      const dayDiff = this.currentDate.getDate() - this.birthDate.getDate()
      const age = yearDiff + (monthDiff < 0 || (monthDiff === 0 && dayDiff < 0) ? -1 : 0)
      return age >= 18
    },
  },
  methods: {
    checkAge() {
      if (!this.idCardNumber || this.idCardNumber.length !== 18) {
        alert('请输入正确的身份证号码')
        return
      }
    },
  },
}
</script>

In the above code, we first The v-model directive is used to bind an input box to the idCardNumber data object, where users can enter their ID number. Then use a button. When the user clicks the button, the checkAge() method is called to verify whether the ID number is correct.

In the computed attribute, we define the birthDate and currentDate attributes, which are used to obtain the birth date and current date of the ID number respectively. Then, we use the isAdult attribute to calculate the user's age. isAdult returns true if the user's age is greater than or equal to 18 years old, otherwise it returns false.

Finally, use the v-if and v-else instructions in the template to display different messages based on the value of isAdult to tell the user whether he is an adult.

This sample code is just a simple example and can be customized and extended according to actual needs. For example, a more stringent ID card verification code can be added to ensure that the entered ID number is legal. Additionally, the ID verification code can be encapsulated into a separate component for reuse within the application.

In short, using Vue to match whether an ID card is an adult is a very practical function that can help us better handle user input and protect user privacy. I hope this article can help readers better understand how to perform ID card verification in Vue, and how to extend and customize the ID card verification function.

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