效果展示
第一步:创建验证码组件
第二步:引入验证码组件并注册使用
总结
效果展示 第一步:创建验证码组件这里是组件的代码,可以自行命名文件名,我这里命名为SIdentify.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>
第二步:引入验证码组件并注册使用
这里data里面的identifyCode的值就是所生成的验证码的值,可以通过该码自行发挥逻辑操作,SIdentify组件其实只是为了显示验证码图片而已,所以不用该组件还可以做成伪手机验证码登录
<template>
<div>
<SIdentify:identifyCode="identifyCode" >
</SIdentify>
</div>
</template>
// 引入登录验证组件
import SIdentify from "@/components/SIdentify";
<script>
export default {
name: "SIdentify",
components: { SIdentify },
data(){
return {
identifyCode: "", //密码登录图形验证码
identifyCodes: "1234567890abcdefghizklmnopqrstuvwxyz", //生成图形验证码的依据
}
},
methods:{
// 刷新验证码
refreshIdentifyCode() {
this.identifyCode = "";
this.makeIdentifyCode(4);
},
// 生成4位数的随机验证码
makeIdentifyCode(l) {
for (let i = 0; i < l; i++) {
this.identifyCode +=
this.identifyCodes[this.randomNum(0, this.identifyCodes.length)];
}
},
// 生成单个验证码
randomNum(min, max) {
return Math.floor(Math.random() * (max - min) + min);
},
},
mounted() {
// 初始化验证码
this.identifyCode = "";
this.makeIdentifyCode(4);
},
}
</script>
总结
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