「组件」图形验证

1：在src下建utils文件夹，建Identify.vue

<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: 30
            },
            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: 120
            },
            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>

 

2：在需要用的界面引入

<div class="flex">
    <el-form-item label="验 证 :" prop="code">
        <el-input v-model="ruleForm.code" placeholder="请输入验证码"></el-input>
    </el-form-item>
    <div class="code" @click="refreshCode">
        <s-identify :identifyCode="identifyCode"></s-identify>
    </div>
</div>
import SIdentify from '@/utils/Identify';
name: 'App';
components: {
    SIdentify
};
data() {
    var checkCode = (rule, value, callback) => {
        if (value != this.identifyCode) {
            callback(new Error('验证码错误'));
        } else {
            callback();
        }
    };
    return {
        identifyCodes: "1234567890",
        identifyCode: "",
        username: '',
        password: '',
        code: ''
rules:{
code: { validator: checkCode, trigger: 'blur' }
}                
    };
},
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)
            ];
        }
    },
}