How to implement verification code verification function in uniapp

How to implement the verification code verification function in uniapp

With the development of mobile Internet, the verification code verification function is widely used in various APPs and websites to increase the security of user login and registration. In uniapp development, it is also very simple to implement the verification code verification function. This article will introduce how to implement the verification code verification function in uniapp, and provide code examples to help developers quickly implement this function.

1. Generate verification code

First, we need to generate a verification code image as the basis for the user to enter the verification code. You can use the third-party library js-captcha to generate verification code images. This library is available on both the browser and server sides. First, we need to install the library, which can be done using npm.

npm install js-captcha

After the installation is complete, we create a utils folder in the uniapp project, and create a captcha.js file under the folder for Generate verification code.

import Captcha from 'js-captcha';

export function generateCaptcha() {
  const captcha = new Captcha();
  captcha.rotate = true;
  captcha.color = [0, 0, 0]; // 设置验证码字体颜色
  captcha.width = 200; // 设置验证码图片宽度
  captcha.height = 80; // 设置验证码图片高度
  const text = captcha.generate();
  const dataURL = captcha.getBase64();

  return {
    text,
    dataURL
  };
}

In the above code example, we defined a generateCaptcha function, which will generate a verification code and return the text of the verification code and the verification code image data in Base64 format.

2. Display the verification code on the front end

Where the verification code needs to be displayed, we can use the <img> tag to display the generated verification code image.

<template>
  <div>
    <img :src="captchaDataURL">
    <input type="text" v-model="captcha" placeholder="请输入验证码">
    <button @click="verifyCaptcha">验证</button>
  </div>
</template>

<script>
import { generateCaptcha } from '@/utils/captcha';

export default {
  data() {
    return {
      captcha: '',
      captchaDataURL: ''
    };
  },
  mounted() {
    const { text, dataURL } = generateCaptcha();
    this.captcha = text;
    this.captchaDataURL = dataURL;
  },
  methods: {
    verifyCaptcha() {
      // 在这里进行验证码验证逻辑
    }
  }
};
</script>

In the above code example, we use the <img> tag to display the verification code image, and save the text of the verification code in the captcha attribute of the component , used for subsequent verification code verification.

3. Verification code verification logic

When the user clicks the verification button, we need to verify the verification code entered by the user. In uniapp development, you can use network request libraries such as uni.request or axios to send the verification code entered by the user to the backend for verification. Here we take uni.request as an example.

export default {
  // ...
  methods: {
    verifyCaptcha() {
      uni.request({
        url: 'http://your-backend-server.com/verifyCaptcha',
        method: 'POST',
        data: {
          captcha: this.captcha
        },
        success: (res) => {
          if (res.data.success) {
            uni.showToast({
              title: '验证成功',
              icon: 'success'
            });
          } else {
            uni.showToast({
              title: '验证失败，请重新输入',
              icon: 'none'
            });
          }
        },
        fail: (err) => {
          console.log(err);
        }
      });
    }
  }
};

In the above code example, we use uni.request to send a POST request and pass the verification code entered by the user to the backend for verification. Based on the return results from the backend, we can give the user a corresponding prompt.

4. Back-end verification code verification

The back-end verification code verification logic can be implemented according to the specific back-end framework. Here we take Node.js and Express framework as examples.

const express = require('express');
const app = express();
const bodyParser = require('body-parser');

app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

app.post('/verifyCaptcha', (req, res) => {
  const { captcha } = req.body;

  // 在这里进行验证码验证逻辑，比较captcha和生成的验证码文本即可

  if (captcha === '生成的验证码文本') {
    res.json({ success: true });
  } else {
    res.json({ success: false });
  }
});

app.listen(3000, () => {
  console.log('Server started on port 3000');
});

In the above code example, we used the Express framework to create a simple web server and used the body-parser middleware to parse the data of the POST request. Then, we verify the verification code in the /verifyCaptcha route and return the corresponding JSON data based on the verification results.

Through the above steps, we have completed the implementation of the verification code verification function in uniapp. When the user enters the verification code and clicks the verification button, the verification code will be passed to the backend for verification, and corresponding prompts will be given based on the verification results.

Summary

This article introduces how to implement the verification code verification function in uniapp, and provides relevant code examples to help developers quickly implement this function. Through the above steps, we can easily implement the verification code verification function in uniapp development and improve the security of user login and registration. Hope this article helps you!

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