vue生成验证码

Vue生成验证码

使用canvas来实现生成验证码

首先建一个组件 identify.vue

代码如下

<template>
    <div class="s-canvas">
        <canvas id="s-canvas" :width="contentWidth" :height="contentHeight"></canvas>
    </div>
</template>

<script>

export default {
  name: 'Identify',
  // data () {
  //   return {
  //   }
  // },
  props: {
    identifyCode: {
    type: String,
    default: '1234'
    },
  fontSizeMin: {
    type: Number,
    default: 25
    },
  fontSizeMax: {
    type: Number,
    default: 40
    },
  backgroundColorMin: {
    type: Number,
    default: 210
    },
  backgroundColorMax: {
    type: Number,
    default: 250
  },
  colorMin: {
    type: Number,
    default: 100
  },
  colorMax: {
    type: Number,
    default: 160
    },
  lineColorMin: {
    type: Number,
    default: 10
    },
  lineColorMax: {
    type: Number,
    default: 100
    },
  dotColorMin: {
    type: Number,
    default: 190
    },
  dotColorMax: {
    type: Number,
    default: 250
    },
  contentWidth: {
    type: Number,
    default: 112
    },
  contentHeight: {
    type: Number,
    default: 38
    }
},
    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 + ')'
        },
        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.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);
            }
            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(-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)
        },
        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>

然后在main.js中导入以下代码

//此处是根据你建Identify.vue的路径
import Identify from './components/code/Identify' //验证码
Vue.use(Identify)

最后在你要渲染验证码的地方写如下代码

 <div class="code" @click="refreshCode">
      <Identify :identifyCode="identifyCode">{{identifyCode}}</Identify>
 </div>


 <script>
  import Identify from '@/components/code/Identify.vue'   //导入验证码
export default {
  name: 'Register',
  data () {
    return {
      sendAuthCode:true,/*布尔值，通过v-show控制显示‘获取按钮’还是‘倒计时’ */
      auth_time: 0, /*倒计时 计数器*/
      code:'',
      identifyCodes: "1234567890",
      identifyCode: ""
    }
  },
  //注册子组件
  components:{
    Identify
  },
  mounted() {
    this.identifyCode = "";
    this.makeCode(this.identifyCodes, 4);
  },
  methods:{
    backMy:function () {
      this.$router.push("/my");
    },
    getAuthCode:function () {
      this.sendAuthCode = false;
      this.auth_time = 20;
      var auth_timetimer =  setInterval(()=>{
        this.auth_time--;
        if(this.auth_time<=0){
          this.sendAuthCode = true;
          clearInterval(auth_timetimer);
        }
      }, 1000);
    },
    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>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
  .code {
    margin: 400px auto;
    width: 114px;
    height: 40px;
    border: 1px solid whitesmoke;
  }
</style>

然后就大功告成了，如有错误烦请各位大神指出。