实现图如下（忽略样式）:
功能：对表单验证，点击右侧验证码图片可以随机切换更新。
实现代码
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">欢迎登录</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="请输入用户名" v-model="form.username"></el-input>
</el-form-item>
<el-form-item prop="password">
<el-input prefix-icon="el-icon-lock" placeholder="请输入密码" v-model="form.password" show-password ></el-input>
</el-form-item>
<el-form-item >
<el-button style="width: 100%;" type="primary" @click="login(form)">登录</el-button>
</el-form-item>
<!-- <el-form-item >-->
<!-- <el-button style="width: 100%;" type="primary" >立即注册</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">第三方登录</div>
<div style="font-size: 14px;color: blue;border-bottom: 1px solid blue;width: 73px;height: 23px;" @click="refresh">验证码登录</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="请输入手机号" 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="请输入验证码" 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)">登录</el-button>
</el-form-item>
<!-- <el-form-item >-->
<!-- <el-button style="width: 100%;" type="primary" >立即注册</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">第三方登录</div>
<div style="font-size: 14px;color: blue;border-bottom: 1px solid blue;width: 90px;height: 23px;" @click="refresh">账号密码登录</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: '请输入名称',
trigger: 'blur',
},
password: {
required: true,
message: '请输入密码',
trigger: 'blur',
},
telephone: {
required: true,
message: '请输入手机号',
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: "请输入验证码",
type: 'error',
})
return
}
if (this.loginType == 'yanzhengma' && this.identifyCode !== this.code) {
this.code = '';
this.refreshCode();
ElMessage({
message: "请输入正确的验证码",
type: 'error',
})
return;
}
//请求合法才可以
this.$refs.form.validate((valid) => {
if (valid) {
request.post("/user/login", this.form).then(res => {
console.log(res)
if (res.code === '0') {
ElMessage({
message: "登录成功",
type: 'success',
})
sessionStorage.setItem("user", JSON.stringify(res.data))
this.$store.commit('imageUrl', res.data.imageUrl)
console.log(this.$store.state.imageUrl);
//登录成功后页面跳转到主页
this.$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 < 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) {
// 绘制干扰点
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>