在uniapp中实现图形验证码的详细步骤

<template>
  <view class="container">
    <view class="phone-container">
      <view class="label-title">
            手机号<label>*</label>
      </view>
      <input 
           v-model="phone"
           placeholder="请输入手机号"
           type="number"
           maxlength="11" />
    </view>
    <view class="verification-container">
      <img
        :src="captchaImage"
        alt="验证码"
        class="captcha"
        @click="refreshCaptcha"
      />
      <input 
        v-model="verificationCode" 
        placeholder="请输入验证码" 
        maxlength="4" 
        type="number" 
        class="verification-input" />
    </view>
    <button @click="sendSMS" class="sendBtn">发送短信</button>
  </view>
</template>

<script>
export default {
  data() {
    return {
      phone: '',             // 用户输入的手机号
      verificationCode: '', // 用户输入的验证码
      captchaImage: '',     // 图形验证码图片地址
    };
  },
  methods: {
    sendSMS() {
      /*
       * 发送短信
       */
      console.log('发送短信到:', this.phone);
    },
    generateCaptcha() {
      /*
       * 生成一个随机的验证码并显示为图片
       */
       // 生成一个4位数的验证码
      const captcha = Math.floor(1000 + Math.random() * 9000);
       // 使用一个免费的图片生成服务
      this.captchaImage = `https://dummyimage.com/100x40/000/fff&text=${captcha}`; 
    },
    refreshCaptcha() {
      /*
       * 刷新验证码
       */
      this.generateCaptcha(); // 重新生成验证码
    },
  },
  mounted() {
    /*
     * 页面加载时生成验证码
     */
    this.generateCaptcha();
  },
};
</script>

<style>
.container {
  padding: 20px;
}

.phone-container {
  margin-bottom: 20px;
}

.label-title {
  font-size: 16px;
  margin-bottom: 5px;
}

input {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

.verification-container {
  display: flex;
  align-items: center;
  margin-bottom: 20px;
}

.captcha {
  width: 100px;
  height: 40px;
  margin-right: 10px;
  cursor: pointer;
}

.verification-input {
  flex: 1;
  padding: 10px;
  font-size: 16px;
  border: 1px solid #ddd;
  border-radius: 4px;
}

.sendBtn {
  background-color: #00ac56;
  color: white;
  padding: 10px;
  border-radius: 4px;
  font-size: 16px;
  cursor: pointer;
}

.sendBtn:hover {
  background-color: #008c4e;
}
</style>