Vue登录验证码

vue登陆验证码代码：

login

<template>
	<div>
        <el-form-item prop="sidentifyMode" v-if="isSidentify >= 1">
            <div class="vfcode">
                <el-input placeholder="请输入验证码" v-model="form.sidentifyMode"></el-input>
                <div @click="refreshCode()" class="vfCodeComponents" title="点击切换验证码">
                    <s-identify :identifyCode="identifyCode"></s-identify>
    		   </div>
    	   </div>
    	</el-form-item>
    </div>
</template>

<script>
    import SIdentify from "../components/SIdentify";
    export default {
        name: "Login",
        components: {
            SIdentify
        },
        data() {
            //校验验证码
            let checkCode = (rule, value, callback) => {
                if(value == this.identifyCode) {
                    callback()
                }else {
                    return callback(new Error('验证码输入错误'));
                }
            };
            return {
                isSidentify:0,//登录失败次数
                identifyCode: '',//生成的四位数验证码
                identifyCodes: '1234567890abcdefjhijklinopqrsduvwxyz',//验证码字符串
                form: {
                    sidentifyMode: '',//表单验证码
                },
                rules: {
                	sidentifyMode:[{required: true, message: "验证码不能为空"},{validator:checkCode,trigger:blur}]
                }
            }
        },
        mounted() {
            this.refreshCode()
        },
        methods: {
            // 更新验证码
            refreshCode() {
                this.identifyCode = ''
                this.makeCode(this.identifyCodes, 4)
            },
            // 随机生成验证码字符串
            makeCode(data, len) {
                for (let i = 0; i < len; i++) {
                    this.identifyCode += this.identifyCodes[this.randomNum(0, this.identifyCodes.length - 1)]
                }
            },
            // 生成随机数
            randomNum(min, max) {
                max = max + 1
                return Math.floor(Math.random() * (max - min) + min)
            }
        }
    }
</script>

<style scoped>
	.vfcode{
        width: 100%;
        display: flex;
    }
    .vfCodeComponents{
        margin-left: 4px;
    }
</style>

SIdentify组件

<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: 18
            },
            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: 111
            },
            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)
                }
            },
            // 绘制文本
            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.identifyCode.length + 1))
                let y = this.randomNum(this.fontSizeMax, this.contentHeight - 5)
                var deg = this.randomNum(-30, 30) // 字符旋转角度(不超过45度比较好)
                // 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)
            },
        },
        watch: {
            identifyCode() {
                this.drawPic()
            }
        },
        mounted() {
            this.drawPic()
        }
    }
</script>
<style scoped>
    #s-canvas{
        border-radius: 4px;
    }
</style>