Vue实战之生成随机验证码

近期正在学习Vue，做项目时遇到此功能，故做此记录，供大家参考交流。

效果展示

效果图

安装插件

下载identify插件，输入如下命令：

npm i identify

创建组件

在components目录新建一个vue组件，例如：SIdentify.vue
源码如下：

<template>
  <!-- 图形验证码 -->
  <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: 35
    },
    fontSizeMax: {
      type: Number,
      default: 35
    },
    backgroundColorMin: {
      type: Number,
      default: 180
    },
    backgroundColorMax: {
      type: Number,
      default: 240
    },
    colorMin: {
      type: Number,
      default: 50
    },
    colorMax: {
      type: Number,
      default: 160
    },
    lineColorMin: {
      type: Number,
      default: 100
    },
    lineColorMax: {
      type: Number,
      default: 200
    },
    dotColorMin: {
      type: Number,
      default: 0
    },
    dotColorMax: {
      type: Number,
      default: 255
    },
    contentWidth: {
      type: Number,
      default: 120
    },
    contentHeight: {
      type: Number,
      default: 40
    }
  },
  methods: {
    // 生成一个随机数
    randomNum(min, max) {
      return Math.floor(Math.random() * (max - min) + min);
    },
    // 生成一个随机的颜色
    randomColor(min, max) {
      let r = this.randomNum(min, max);
      let g = this.randomNum(min, max);
      let b = this.randomNum(min, max);
      return "rgb(" + r + "," + g + "," + b + ")";
    },
    transparent() {
      return "rgb(255,255,255)";
    },
    drawPic() {
      let canvas = document.getElementById("s-canvas");
      let ctx = canvas.getContext("2d");
      ctx.textBaseline = "bottom";
      // 绘制背景
      ctx.fillStyle = this.randomColor(
        this.backgroundColorMin,
        this.backgroundColorMax
      );
      ctx.fillStyle = this.transparent();
      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);
      }
       // 绘制背景
      this.drawLine(ctx)
      this.drawDot(ctx)
    },
    drawText(ctx, txt, i) {
      ctx.fillStyle = this.randomColor(this.colorMin, this.colorMax);
      ctx.font =
        this.randomNum(this.fontSizeMin, this.fontSizeMax) + "px SimHei";
      let x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1));
      let y = this.randomNum(this.fontSizeMax, this.contentHeight - 5);
      var deg = this.randomNum(-10, 10);
      // 修改坐标原点和旋转角度
      ctx.translate(x, y);
      ctx.rotate((deg * Math.PI) / 180);
      ctx.fillText(txt, 0, 0);
      // 恢复坐标原点和旋转角度
      ctx.rotate((-deg * Math.PI) / 180);
      ctx.translate(-x, -y);
    },
    drawLine(ctx) {
      // 绘制干扰线
      for (let i = 0; i < 8; i++) {
        ctx.strokeStyle = this.randomColor(
          this.lineColorMin,
          this.lineColorMax
        );
        ctx.beginPath();
        ctx.moveTo(
          this.randomNum(0, this.contentWidth),
          this.randomNum(0, this.contentHeight)
        );
        ctx.lineTo(
          this.randomNum(0, this.contentWidth),
          this.randomNum(0, this.contentHeight)
        );
        ctx.stroke();
      }
    },
    drawDot(ctx) {
      // 绘制干扰点
      for (let i = 0; i < 100; i++) {
        ctx.fillStyle = this.randomColor(0, 255);
        ctx.beginPath();
        ctx.arc(
          this.randomNum(0, this.contentWidth),
          this.randomNum(0, this.contentHeight),
          1,
          0,
          2 * Math.PI
        );
        ctx.fill();
      }
    }
  },
  watch: {
    identifyCode() {
      this.drawPic();
    }
  },
  mounted() {
    this.drawPic();
  }
};
</script>

引用该组件

<template>
<div class="get-code" @click="refreshCode()">
    <s-identify :identifyCode="identifyCode"></s-identify>
</div>
</template>
<script>
    import SIdentify from "@/components/SIdentify.vue";
    export default {
        components: { SIdentify },
        data() {
           return {
                identifyCode: "",
                identifyCodes: "0123456789abcdwerwshdjeJKDHRJHKOOPLMKQ", //随便
            }
        },
        methods: {            
           refreshCode() {
             this.identifyCode = "";
             this.makeCode(this.identifyCodes,4);
           },
           randomNum (min, max) {
             max = max + 1
             return Math.floor(Math.random() * (max - min) + min)
           },
           // 随机生成验证码字符串
           makeCode (data, len) {
             for (let i = 0; i < len; i++) {
             this.identifyCode += data[this.randomNum(0, data.length - 1)]
           }
        }
    }
</script>

补充

如果想要简洁的背景可去掉如下

简单背景

效果如下：

效果

文章来源