vue實現驗證碼登錄

實現圖如下（忽略樣式）:

 

功能：對表單驗證，點擊右側驗證碼圖片可以隨機切換更新。

 

實現代碼

HTML:

<template>
    <div style="width: 100%;height: 100vh; background-color: blueviolet;overflow: hidden">
        <div style="width: 400px; margin: 150px auto">
            <div style="color: #ccc; font-size: 30px; text-align: center; padding: 30px 0">歡迎登錄</div>
            <div v-if="loginType=='denglu'">
                <el-form ref="form" :model="form" size="normal" :rules="rules">
                    <el-form-item prop="username">
                        <el-input prefix-icon="el-icon-user-solid" placeholder="請輸入用戶名" v-model="form.username"></el-input>
                    </el-form-item>
                    <el-form-item  prop="password">
                        <el-input prefix-icon="el-icon-lock" placeholder="請輸入密碼" v-model="form.password" show-password ></el-input>
                    </el-form-item>
                    <el-form-item >
                        <el-button style="width: 100%;" type="primary" @click="login(form)">登錄</el-button>
                    </el-form-item>
                    <!--                <el-form-item >-->
                    <!--                    <el-button style="width: 100%;" type="primary" >立即注冊</el-button>-->
                    <!--                </el-form-item>-->
                    <div style="display: flex; justify-content: center">
                        <div style="font-size: 14px;color: blue;border-bottom: 1px solid blue;width: 73px;height: 23px;margin-right: 100px">第三方登錄</div>
                        <div style="font-size: 14px;color: blue;border-bottom: 1px solid blue;width: 73px;height: 23px;" @click="refresh">驗證碼登錄</div>
                    </div>
                </el-form>
            </div>
            <div v-else>
                <el-form ref="form" :model="form" size="normal" :rules="rules">
                    <el-form-item prop="telephone">
                        <el-input prefix-icon="el-icon-user-solid" placeholder="請輸入手機號" v-model="form.telephone"></el-input>
                    </el-form-item>
                    <el-form-item >
                        <div style="display: flex">
                            <div style="width: 200px; margin-right: 100px">
                                <el-input prefix-icon="el-icon-lock" placeholder="請輸入驗證碼" v-model="code" ></el-input>
                            </div>
                            <div class="login-code" style="cursor: pointer" @click="refreshCode"><s-identify :identifyCode="identifyCode"></s-identify></div>
                        </div>
                    </el-form-item>
                    <el-form-item >
                        <el-button style="width: 100%;" type="primary" @click="login(form)">登錄</el-button>
                    </el-form-item>
                    <!--                <el-form-item >-->
                    <!--                    <el-button style="width: 100%;" type="primary" >立即注冊</el-button>-->
                    <!--                </el-form-item>-->
                    <div style="display: flex; justify-content: center">
                        <div style="font-size: 14px;color: blue;border-bottom: 1px solid blue;width: 73px;height: 23px;margin-right: 100px">第三方登錄</div>
                        <div style="font-size: 14px;color: blue;border-bottom: 1px solid blue;width: 90px;height: 23px;" @click="refresh">賬號密碼登錄</div>
                    </div>
                </el-form>
            </div>
        </div>
    </div>
</template>

　　JS：

import {ElMessage} from "element-plus";
import request from "../utils/request";
import SIdentify from "../components/SIdentify.vue";

export default {
    name: "Layout",
    components: { SIdentify },
    data() {
        return {
            form: {},
            loginType: 'yanzhengma',
            identifyCode: '',
            identifyCodes: '1234567890',
            code: '',
            rules: {
                username: {
                    required: true,
                    message: '請輸入名稱',
                    trigger: 'blur',
                },
                password: {
                    required: true,
                    message: '請輸入密碼',
                    trigger: 'blur',
                },
                telephone: {
                    required: true,
                    message: '請輸入手機號',
                    trigger: 'blur',
                }

            }
        }
    },
    created() {
        sessionStorage.removeItem("user");
        this.refreshCode();
    },
    mounted() {
        this.identifyCode = "";
        this.makeCode(this.identifyCodes, 4);
    },
    methods: {
        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);
        },
        randomNum(min, max) {
            return Math.floor(Math.random() * (max - min) + min);
        },
        refresh() {
            if (this.loginType == 'yanzhengma') {
                this.loginType = 'denglu'
            } else {
                this.loginType = 'yanzhengma'
            }
        },

        login(form) {
            if (this.loginType == 'yanzhengma' && this.code == '') {
                ElMessage({
                    message: "請輸入驗證碼",
                    type: 'error',
                })
                return
            }
            if (this.loginType == 'yanzhengma' && this.identifyCode !== this.code) {
                this.code = '';
                this.refreshCode();
                ElMessage({
                    message: "請輸入正確的驗證碼",
                    type: 'error',
                })
                return;
            }
            //請求合法才可以
            this.$refs.form.validate((valid) => {
                if (valid) {
                    request.post("/user/login", this.form).then(res => {
                        console.log(res)
                        if (res.code === '0') {
                            ElMessage({
                                message: "登錄成功",
                                type: 'success',
                            })
                            sessionStorage.setItem("user", JSON.stringify(res.data))
                            this.$store.commit('imageUrl', res.data.imageUrl)
                            console.log(this.$store.state.imageUrl);
                            //登錄成功后頁面跳轉到主頁
                            this.$router.push("/")
                        } else {
                            ElMessage({
                                message: res.msg,
                                type: 'error',
                            })
                        }
                    })
                }
            })

        }
    }
}

　　

 

 component：

SIdentity.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: 25
            },
            fontSizeMax: {
                type: Number,
                default: 30
            },
            backgroundColorMin: {
                type: Number,
                default: 255
            },
            backgroundColorMax: {
                type: Number,
                default: 255
            },
            colorMin: {
                type: Number,
                default: 0
            },
            colorMax: {
                type: Number,
                default: 160
            },
            lineColorMin: {
                type: Number,
                default: 100
            },
            lineColorMax: {
                type: Number,
                default: 255
            },
            dotColorMin: {
                type: Number,
                default: 0
            },
            dotColorMax: {
                type: Number,
                default: 255
            },
            contentWidth: {
                type: Number,
                default: 112
            },
            contentHeight: {
                type: Number,
                default: 31
            }
        },
        methods: {
            // 生成一個隨機數
            randomNum(min, max) {
                return Math.floor(Math.random() * (max - min) + min)
            },
            // 生成一個隨機的顏色
            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'
                // 繪制背景
                ctx.fillStyle = this.randomColor(this.backgroundColorMin, this.backgroundColorMax)
                ctx.fillRect(0, 0, this.contentWidth, this.contentHeight)
                // 繪制文字
                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)
                // 修改坐標原點和旋轉角度
                ctx.translate(x, y)
                ctx.rotate(deg * Math.PI / 180)
                ctx.fillText(txt, 0, 0)
                // 恢復坐標原點和旋轉角度
                ctx.rotate(-deg * Math.PI / 180)
                ctx.translate(-x, -y)
            },
            drawLine(ctx) {
                // 繪制干擾線
                for (let i = 0; i < 5; 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) {
                // 繪制干擾點
                for (let i = 0; i < 80; 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 scoped>
    .s-canvas {
        height: 38px;

    }
    .s-canvas canvas{
        margin-top: 1px;
        margin-left: 8px;
    }
</style>