Vue 之 图形验证码

完美，其实很简单，用canvas画图即可，上代码

HTML

<template>
  <div class="profily-layout">
    <div class="textBox">
      <div class="disflexBox">
        <p class="textName">
          <input
            type="text"
            placeholder="请输入验证码"
            v-model="CodeWrite"
            @keyup.13="login"
            class="text-input"
          />
        </p>
        <div class="code_box" @click="changeCode">
          <canvas
            id="modifyCanvas"
            width="100%"
            height="50"
            ref="modifyCanvas"
          ></canvas>
        </div>
      </div>
    </div>
    <button class="login-btn" @click="login">登录</button>
  </div>
</template>

JS

<script>
export default {
  name: "profily",
  props: {},
  components: {},
  data() {
    return {
      CodeWrite: "", // 验证码

      verificationCode: [], //当前生成的二维码信息
    };
  },
  methods: {
    //进行二维码的绘制
    changeCode() {
      this.draw(this.verificationCode);
    },
    //生成并渲染出验证码图形
    draw(show_num) {
      let canvas = document.getElementById("modifyCanvas"); //获取到canvas的对象
      let canvas_width = canvas.width;
      let canvas_height = canvas.height;
      let context = canvas.getContext("2d"); //获取到canvas画图的环境，演员表演的舞台
      canvas.width = canvas_width;
      canvas.height = canvas_height;
      let sCode =
        "a,b,c,d,e,f,g,h,i,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z,A,B,C,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,W,X,Y,Z,1,2,3,4,5,6,7,8,9,0";
      let aCode = sCode.split(",");
      let aLength = aCode.length; //获取到数组的长度
      for (let i = 0; i < 4; i++) {
        //这里的for循环可以控制验证码位数（如果想显示6位数，4改成6即可）
        let j = Math.floor(Math.random() * aLength); //获取到随机的索引值
        // let deg = Math.random() * 30 * Math.PI / 180;//产生0~30之间的随机弧度
        let deg = Math.random() - 0.5; //产生一个随机弧度
        let txt = aCode[j]; //得到随机的一个内容
        show_num[i] = txt.toLowerCase();
        let x = 4 + i * 20; //文字在canvas上的x坐标
        let y = 30 + Math.random() * 8; //文字在canvas上的y坐标
        context.font = "bold 23px 微软雅黑";
        context.translate(x, y);
        context.rotate(deg);
        context.fillStyle = this.randomColor();
        context.fillText(txt, 0, 0);
        context.rotate(-deg);
        context.translate(-x, -y);
      }
      for (let i = 0; i <= 30; i++) {
        //验证码上显示小点
        context.strokeStyle = this.randomColor();
        context.beginPath();
        let x = Math.random() * canvas_width;
        let y = Math.random() * canvas_height;
        context.moveTo(x, y);
        context.lineTo(x + 1, y + 1);
        context.stroke();
      }
    },
    //得到随机的颜色值
    randomColor() {
      let r = Math.floor(Math.random() * 256);
      let g = Math.floor(Math.random() * 256);
      let b = Math.floor(Math.random() * 256);
      return "rgb(" + r + "," + g + "," + b + ")";
    },

    // 登录
    login() {
      //判断验证码
      if (this.CodeWrite == "") {
        return console.log("验证码不能为空");
      }
      if (this.CodeWrite.toLowerCase() !== this.verificationCode.join("")) {
        return console.log("验证码输入错误！");
      }
      console.log("验证码输入成功哦");
    },
  },
  mounted() {
    this.changeCode();
  },
  computed: {},
  watch: {},
  filters: {},
};
</script>

CSS

<style lang='less' scoped>
.profily-layout {
  .textBox {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 400;
    margin-top: 16px;
    .textTitle {
      font-size: 10px;
      width: 30px;
      height: 30px;
      margin-right: 18px;
    }
    .disflexBox {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-direction: row;
      cursor: pointer;
      height: 50px;
      overflow: hidden;
      width: 390px;
      max-width: 390px;
    }
    .code_box {
      margin-left: 30px;
    }
    .textName {
      color: #44566c;
      font-size: 16px;
      flex: 1;
      background: none;
      display: flex;
      align-items: center;
      height: 100%;
      font-weight: 400;
      .text-input {
        color: #44566c;
        flex: 1;
        background: #f2f5f9;
        height: 100%;
        padding-left: 21px;
        padding-right: 21px;
        width: 100%;
        font-size: 16px;
        border-radius: 5px;
        border: none;
        outline: none;
      }
      .text-input:hover,
      .text-input:focus {
        border: none;
        outline: none;
      }
      .text-input::-webkit-input-placeholder {
        color: #8d9eae;
      }
      .text-input::-moz-input-placeholder {
        color: #8d9eae;
      }
      .text-input::-ms-input-placeholder {
        color: #8d9eae;
      }
    }
  }
  .login-btn {
    width: 100px;
    height: 30px;
    line-height: 30px;
    background-color: red;
    border: none;
    margin-top: 30px;
  }
}
</style>