【vue】canvas验证码组件--数字/数字加字母

基于canvas的数字/数字+字符验证码   SIdentify.vue 组件

<!-- 基于canvas的数字/数字+字符验证码 -->
<!-- 调用格式
     <s-identify
     @func="getMsgFormSon"
     :isRefreshCode="isRefreshCode"
     :identifyCodes="identifyCodes"   //可选传，选传写法有要求
     ></s-identify> -->
<template>
  <div class="s-canvas">
    <canvas id="s-canvas" :width="contentWidth" :height="contentHeight"></canvas>
  </div>
</template>
<script>
export default {
  name: "SIdentify",
  props: {
    isRefreshCode: {
      type: Boolean,
      default: false
    },
    identifyCodes: {
      type: Array
    },
    identifyLen: {
      type: Number,
      default: 4
    },
    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: 112
    },
    contentHeight: {
      type: Number,
      default: 32
    }
  },
  data() {
    return {
      nums: [
        "1",
        "2",
        "3",
        "4",
        "5",
        "6",
        "7",
        "8",
        "9",
        "0",
        "A",
        "B",
        "C",
        "D",
        "E",
        "F",
        "G",
        "H",
        "I",
        "J",
        "K",
        "L",
        "M",
        "N",
        "O",
        "P",
        "Q",
        "R",
        "S",
        "T",
        "U",
        "V",
        "W",
        "X",
        "Y",
        "Z",
        "a",
        "b",
        "c",
        "d",
        "e",
        "f",
        "g",
        "h",
        "i",
        "j",
        "k",
        "l",
        "m",
        "n",
        "o",
        "p",
        "q",
        "r",
        "s",
        "t",
        "u",
        "v",
        "w",
        "x",
        "y",
        "z"
      ],
      identifyText: ""
    };
  },
  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 + ")";
    },
    // 绘制干扰线
    drawLine(ctx) {
      for (let i = 0; i < 6; 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();
      }
    },
    // 绘制干扰点
    drawDot(ctx) {
      for (let i = 0; i < 50; i++) {
        ctx.fillStyle = this.randomColor(0, 255);
        ctx.beginPath();
        ctx.arc(
          this.randomNum(0, this.contentWidth),
          this.randomNum(0, this.contentHeight),
          1,
          0,
* Math.PI
        );
        ctx.fill();
      }
    },
    // 生成l长度的验证码
    makeCode(o, l) {
      let identifyCodes = o;
      this.identifyText = "";
      for (let i = 0; i < l; i++) {
        this.identifyText +=
          identifyCodes[this.randomNum(0, identifyCodes.length)];
      }
    },
    // 验证码文本
    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.identifyText.length + 1));
      let y = this.randomNum(this.fontSizeMax, this.contentHeight - 5);
      var deg = this.randomNum(-45, 45);
      // 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);
    },
    // 验证码图形
    drawPic() {
      let identifyCodesArray = this.identifyCodes
        ? this.identifyCodes
        : this.nums;
      this.makeCode(identifyCodesArray, this.identifyLen);
      let identifyCode = "";
      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.fillRect(0, 0, this.contentWidth, this.contentHeight);
      console.log(this.identifyText, "huizhi");
      // 绘制文字
      for (let i = 0; i < this.identifyLen; i++) {
        this.drawText(ctx, this.identifyText[i], i);
        identifyCode += this.identifyText[i];
      }
      //   for (let i = 0; i < this.identifyArray.length; i++) {
      //     this.drawText(ctx, this.identifyArray[i], i);
      //   }
      this.drawLine(ctx);
      this.drawDot(ctx);
      console.log(identifyCode, "要传的值");
      // 向父组件传值
      this.$emit("func", identifyCode);
    }
  },
  watch: {
    if (this.isRefreshCode) {
        this.drawPic();
      }
  },
  mounted() {
    this.drawPic();
  }
};
</script>
<style lang="scss" scoped>
.s-canvas {
  height: 32px;
  canvas {
    margin-top: 1px;
    margin-left: 8px;
  }
}
</style>

父组件调用

①默认 数字+字母验证码 形式

<template>
  <div>
     <el-input v-model="verificationCode" placeholder="验证码" />
      <div class="identify-code" @click="refreshCode">
                <!--验证码组件-->
                <s-identify @func="getSidentifyCode" :isRefreshCode="isRefreshCode"></s-identify>
      </div>

  </div>
</template>
<script>
import Vue from "vue";
import SIdentify from "./common/SIdentify";

export default {
  components: { SIdentify },
  data() {
    return {
      verificationCode: "",
      identifyCode: "",
      isRefreshCode: false,
    };
  },
  created() {
    // this.refreshCode();
  },
  mounted() {},
  watch: {},
  methods: {
    refreshCode() {
      this.identifyCode = "";
      this.isRefreshCode = true;   //更改状态--SIdentify组件中监听该状态
    },
    getSidentifyCode(data) {
      this.identifyCode = data;
      this.isRefreshCode = false;
      console.log(this.identifyCode, "接收到的code");
    }
  }
};
</script>
<style lang="scss" scoped>
  .identify-code {
    display: inline-block;
  }
}
</style>

②通过传  纯数字  为数字验证码

<template>
  <div>
     <el-input v-model="verificationCode" placeholder="验证码" />
      <div class="identify-code" @click="refreshCode">
                <!--验证码组件-->
                <s-identify @func="getSidentifyCode" :isRefreshCode="isRefreshCode"></s-identify>
      </div>

  </div>
</template>
<script>
import Vue from "vue";
import SIdentify from "./common/SIdentify";

export default {
  components: { SIdentify },
  data() {
    return {
      verificationCode: "",
      identifyCodes: ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"],
      identifyCode: "",
      isRefreshCode: false,
    };
  },
  created() {
    this.refreshCode();
  },
  mounted() {},
  watch: {},
  methods: {
    refreshCode() {
      this.identifyCode = "";
      this.isRefreshCode = true;   //更改状态--SIdentify组件中监听该状态
      // 随机排序
      if (this.identifyCodes.length) {
        let tempCodesArray = this.identifyCodes.sort(function() {
          return Math.random() - 0.5;
        });
        this.identifyCodes = tempCodesArray;
      }
    },
    getSidentifyCode(data) {
      this.identifyCode = data;
      this.isRefreshCode = false;
      console.log(this.identifyCode, "接收到的code");
    }
  }
};
</script>
<style lang="scss" scoped>
  .identify-code {
    display: inline-block;
  }
}
</style>

     当用方式②时， SIdentify.vue 组件 可以略去 isRefreshCode的监听判断，改为监听 identifyCodes

     代码段为 

SIdentify.vue

<script>
export default { 
... 
  watch: {
     identifyCodes() {
       this.drawPic();
     }
   //,
   // isRefreshCode() {
   //   this.drawPic();
   // }
  }

};
</script>
<style lang="scss" scoped>
.
.
.
</style>