<template>
    <el-form class="login-form" status-icon :rules="loginRules" ref="loginForm" :model="loginForm" label-width="80px">
        <el-form-item prop="username" label="用户:">
            <el-input v-model="loginForm.username" auto-complete="off" placeholder="请输入用户名" size="medium" @keyup.enter.native="submitForm('loginForm')"></el-input>
        </el-form-item>
        <el-form-item prop="password" label="密码:">
            <el-input :type="passwordType" v-model="loginForm.password" auto-complete="off" placeholder="请输入密码" size="medium">
                <i class="el-icon-view el-input__icon" slot="suffix" @click="showPassword"></i>
            </el-input>
        </el-form-item>
        <el-form-item prop="code">
            <el-row :span="24">
                <el-col :span="12">
                    <el-input v-model="loginForm.code" auto-complete="off" placeholder="请输入验证码" size="" @keyup.enter.native="submitForm('loginForm')"></el-input>
                </el-col>
                <el-col :span="12">
                    <div class="login-code" @click="refreshCode">
                        <!--验证码组件-->
                        <s-identify :identifyCode="identifyCode"></s-identify>
                    </div>
                </el-col>
            </el-row>
        </el-form-item>
        <el-form-item>
            <el-button type="primary" @click="submitForm('loginForm')" class="login-submit">登录</el-button>
        </el-form-item>
    </el-form>
</template>

<script>
import { isLoginName } from '@/util/validate'
import SIdentify from './sidentify'
export default {
    name: 'userLogin',
    components: { SIdentify },
    data() {
        const validateCode = (rule, value, callback) => {
            if (this.identifyCode !== value) {
                this.loginForm.code = ''
                this.refreshCode()
                callback(new Error('请输入正确的验证码'))
            } else {
                callback()
            }
        }
        return {
            isDebugLogin: false,
            loginForm: {
                username: '',
                password: '',
                code: ''
            },
            identifyCodes: '1234567890',
            identifyCode: '',
            loginRules: {
                username: [
                    { required: true, trigger: 'blur', message: '请输入用户名' },
                    { min: 1, max: 200, message: '长度在1-200字符之间', trigger: 'blur' },
                    { validator: isLoginName, trigger: 'blur' }
                ],
                password: [
                    { required: true, message: '请输入密码', trigger: 'blur' },
                    { min: 1, max: 100, message: '长度在1-100字符之间', trigger: 'blur' }
                ],
                code: [
                    { required: true, message: '请输入验证码', trigger: 'blur' },
                    { validator: validateCode, trigger: 'blur' }
                ]
            },
            passwordType: 'password'
        }
    },
    watch: {
        isDebugLogin(v) {
            if (v) {
                this.loginForm.password = '123'
                this.refreshCode()
            }
        },
        identifyCode(v) {
            this.isDebugLogin && (this.loginForm.code = v)
        }
    },
    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)
                ]
            }
        },
        showPassword() {
            this.passwordType === ''
                ? (this.passwordType = 'password')
                : (this.passwordType = '')
        },
        submitForm(formName) {
            this.$refs[formName].validate(valid => {
                if (valid) {
                    console.log('授权成功')
                } else {
                    return false
                }
            })
        }
    },
    created() {
        this.refreshCode()
    }
}
</script>

<style>
.login-form .el-input__inner {
    height: 40px;
    line-height: 40px;
}
.login-form .el-form-item__label {
    line-height: 40px;
}
.login-submit.el-button {
    padding: 12px 20px;
}
</style>
<style lang="scss" scoped>
.login-form {
    padding: 10px 0;
    .el-form-item + .el-form-item {
        margin-top: 30px;
    }
    .login-code {
        cursor: pointer;
        .login-code-img {
            width: 100px;
            height: 38px;
            background-color: #eee;
            border: 1px solid #f0f0f0;
            color: #333;
            font-size: 18px;
            font-weight: bold;
            letter-spacing: 2px;
            text-indent: 2px;
            text-align: center;
        }
    }
    .login-submit {
        width: 100%;
        border: 0;
    }
}
</style>

验证码组件

<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: 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: 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>
<style lang="scss" scoped>
.s-canvas {
    height: 38px;
    canvas {
        margin-top: 1px;
        margin-left: 8px;
    }
}
</style>

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