验证码组件
创建一个验证码的vue组件
将下列代码复制到主机中在其他页面引入
identifyCode为验证码,传入字符串即可
<template>
<div class="s-canvas">
<canvas id="s-canvas" :width="contentWidth" :height="contentHeight"></canvas>
</div>
</template>
<script>
export default {
name: 'identify',
props: {
identifyCode: {
//默认注册码
type: String,
default: '1234'
},
fontSizeMin: {
// 字体最小值
type: Number,
default: 25
},
fontSizeMax: {
// 字体最大值
type: Number,
default: 35
},
backgroundColorMin: {
// 验证码图片背景色最小值
type: Number,
default: 200
},
backgroundColorMax: {
// 验证码图片背景色最大值
type: Number,
default: 220
},
dotColorMin: {
// 背景干扰点最小值
type: Number,
default: 60
},
dotColorMax: {
// 背景干扰点最大值
type: Number,
default: 120
},
contentWidth: {
//容器宽度
type: Number,
default: 116
},
contentHeight: {
//容器高度
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(50, 160) //随机生成字体颜色
ctx.font =
this.randomNum(this.fontSizeMin, this.fontSizeMax) + 'px SimHei' //随机生成字体大小
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)
// 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 < 4; i++) {
ctx.strokeStyle = this.randomColor(100, 200)
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 < 30; 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>