生成验证码图片 vue

接上一篇生成验证码文章，经修改生成了一个简单验证码，供大家参考
identify.vue组件（主要用于定义参数和方法）

<template>
  <div class="s-canvas">
    <canvas id="s-canvas" :width="contentWidth" :height="contentHeight"></canvas>
  </div>
</template>
<script>
export default {
  name: 'SIdentify',
  props: {
    identifyCode: {
      type: String,
      default: '1234'
    },
    fontSizeMin: {
      type: Number,
      default: 16
    },
    fontSizeMax: {
      type: Number,
      default: 40
    },
    backgroundColorMin: {
      type: Number,
      default: 180
    },
    backgroundColorMax: {
      type: Number,
      default: 240
    },
    colorMin: {
      type: Number,
      default: 50
    },
    colorMax: {
      type: Number,
      default: 160
    },
    lineColorMin: {
      type: Number,
      default: 40
    },
    lineColorMax: {
      type: Number,
      default: 180
    },
    dotColorMin: {
      type: Number,
      default: 0
    },
    dotColorMax: {
      type: Number,
      default: 255
    },
    contentWidth: {
      type: Number,
      default: 80
    },
    contentHeight: {
      type: Number,
      default: 38
    }
  },
  methods: {
    // 生成一个随机数
    randomNum (min, max) {
      return Math.floor(Math.random() * (max - min) + min)
    },
    drawPic () {
      const canvas = document.getElementById('s-canvas')
      const ctx = canvas.getContext('2d')
      ctx.textBaseline = 'bottom'
      // 绘制背景
      ctx.fillStyle = 'rgb(174,201,230)'
      ctx.fillRect(0, 0, this.contentWidth, this.contentHeight)
      // 绘制文字
      for (let i = 0; i < this.identifyCode.length; i++) {
        this.drawText(ctx, this.identifyCode[i], i)
      }
    },
    drawText (ctx, txt, i) {
      ctx.fillStyle = 'rgb(51,51,103)'
      ctx.font = '18px SimHei'
      const x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1))
      // 修改坐标原点和旋转角度
      ctx.translate(x, 30)
      ctx.fillText(txt, 0, 0)
      // 恢复坐标原点和旋转角度
      ctx.translate(-x, -30)
    }
  },
  watch: {
    identifyCode () {
      this.drawPic()
    }
  },
  mounted () {
    this.drawPic()
  }
}
</script>

在 main.js进行引入（注意路径的地址）：

import SIdentify from './components/page/identify'
Vue.component('s-identify', SIdentify)

test.vue(在页面进行使用)：

<template>
  <div class="code" @click="refreshCode">
    <s-identify :identifyCode="identifyCode"></s-identify>
  </div>
</template>

<script>
export default {
  data() {
    return {
      identifyCodes: '1234567890abcdefg',
      identifyCode: ''
    }
  },
  mounted() {
    this.identifyCode = ''
    this.makeCode(this.identifyCodes, 4)
  },
  methods: {
    randomNum(min, max) {
      return Math.floor(Math.random() * (max - min) + min)
    },
    refreshCode() {
      this.identifyCode = ''
      this.makeCode(this.identifyCodes, 4)
    },
    makeCode(o, l) {
      for (let i = 0; i < l; i++) {
        this.identifyCode += this.identifyCodes[
          this.randomNum(0, this.identifyCodes.length)
        ]
      }
      console.log(this.identifyCode)
    }
  }
}
</script>

<style>
  .code {
    margin: 50px auto;
    width: 114px;
    height: 40px;
    /*border: 1px solid red;*/
  }
</style>

效果图：

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