组件代码如下：
html;gutter:true;
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) {
var r = this.randomNum(min, max)
var g = this.randomNum(min, max)
var b = this.randomNum(min, max)
return 'rgb(' + r + ',' + g + ',' + b + ')'
},
drawPic() {
var canvas = document.getElementById('s-canvas')
var 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'
var x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1))
var 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()
}
}
},
// 监听--watch中包含immediate属性和deep属性。immediate属性：immediate:true，首次绑定的时候执行watch中的方法；immediate:false，当数据发生变化时执行watch中的方法（首次绑定时不执行）
watch: {
identifyCode: {
handler() {
this.drawPic()
},
immediate: false
}
},
// mounted 完成挂载：在这发起后端请求，拿回数据，配合路由钩子做一些事情
mounted() {
this.drawPic()
}
}</p>
<pre><code>
;gutter:true;
看不清，换一张
import SIdentify from ‘./RandomCode.vue’
export default {
name: ‘userlogin’,
data() {
// 自定义验证规则：验证码验证规则
const validateVerifycode = (rule, value, callback) => {
if (value === ”) {
callback(new Error(‘请输入验证码’))
} else if (value !== this.identifyCode) {
console.log(‘validateVerifycode:’, value)
callback(new Error(‘验证码不正确’))
} else {
callback()
}
}
return {
loginForm: {
verifycode: ”
},
identifyCodes: ‘1234567890’,
identifyCode: ”,
loginRules: {
verifycode: [
{ required: true, trigger: ‘blur’, validator: validateVerifycode },
]
}
}
},
components: {
// 注册绘制随机验证码的组件
SIdentify
},
created() {},
mounted() {
// 验证码初始化
this.identifyCode = ”
this.makeCode(this.identifyCodes, 4)
},
computed: {},
methods: {
// 生成随机数
randomNum(min, max) {
return Math.floor(Math.random() * (max – min) + min)
},
// 切换验证码
refreshCode() {
this.identifyCode = ”
this.makeCode(this.identifyCodes, 4)
},
// 生成四位随机验证码
makeCode(o, l) {
for (let i = 0; i < l; i++) {
this.identifyCode += this.identifyCodes[this.randomNum(0, this.identifyCodes.length)]
}
console.log(this.identifyCode)
}
}
}
.randomcodeuse{
width: 60%;
margin: auto;
display: flex;
align-items: center;
}
.identifybox {
display: flex;
justify-content: space-between;
margin-top: 7px;
}
.iconstyle {
color: #409EFF;
}
Original: https://www.cnblogs.com/henuyuxiang/p/16419827.html
Author: 岁月淡忘了谁
Title: Vue随机验证码组件
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