vue图片验证码
作者：互联网
先看效果
1.验证码组件
<template>
<div class="s-canvas">
<canvas id="s-canvas" :width="contentWidth" :height="contentHeight" @click="Refresh"></canvas>
</div>
</template>
<script>
export default {
name: 'SIdentify',
props: {
identifyCode: {
type: String,
default: ["a", "v", "q", "p", "y", "b", "c", "d", "e", "f", "h", "x", "z", "t", "j", "k", "l", "C", "D", "E", "F", "G", "H", "T", "Y", "U", "I", "O", "K", "L", "M", "N", "S", "A", "B"]
},
},
data() {
return {
//定义容器接收验证码
nums: '',
fontSizeMin: 45,
fontSizeMax: 35,
backgroundColorMin: 180,
backgroundColorMax: 240,
colorMin: 50,
colorMax: 160,
lineColorMin: 40,
lineColorMax: 180,
dotColorMin: 0,
dotColorMax: 255,
contentWidth: 120,
contentHeight: 40
}
},
methods: {
//组件通信
getData() {
this.$emit("getData", this.nums);
},
// 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() {
var arr = [] //定义一个数组用来接收产生的随机数
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) //图形填充颜色设置
ctx.strokeStyle = this.randomColor(this.backgroundColorMin, this.backgroundColorMax) //图形轮廓的颜色设置
ctx.fillRect(0, 0, this.contentWidth, this.contentHeight) //绘制一个填充的矩形 0 0 width height x起点 y起点 宽 高
ctx.strokeRect(0, 0, this.contentWidth, this.contentHeight) // 绘制一个矩形边框 0 0 width height x起点 y起点 宽 高
// ctx.clearRect(50,0,this.contentWidth,this.contentHeight) //清除指定矩形区域，清除部分完全透明
// 绘制文字
for (let i = 0; i < 4; i++) {
var index = Math.floor(Math.random() * 34);//随机索引值
// var txt = identifyCode[index];
this.drawText(ctx, this.identifyCode[index], i)
arr[i] = this.identifyCode[index] //接收产生的随机数
}
this.nums = arr[0] + arr[1] + arr[2] + arr[3] //将产生的验证码放入num
this.getData();
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' //字体大小
ctx.textBaseline = 'alphabetic' //基线对齐
let x = 20 + i * 25;
// let y = 20 + 10 * Math.random();
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)//移动不同位置 参数偏移量
ctx.rotate(deg * Math.PI / 180) //旋转 参数角度
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 < 10; i++) {
ctx.strokeStyle = this.randomColor(this.lineColorMin, this.lineColorMax)
ctx.beginPath() //新建一条路径
ctx.moveTo(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight)) //设置起点x,y
ctx.lineTo(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight)) //绘制直线 x,y 一条当前位置到x,y点的直线
ctx.stroke() // 通过线条绘制图形轮廓
// ctx.closePath() //结束闭合路径
}
},
drawDot(ctx) {
// 绘制干扰点
for (let i = 0; i < 120; i++) {
ctx.fillStyle = this.randomColor(0, 255)
ctx.beginPath()
// 绘制圆弧或圆，x,y,radius，startAngle,endAngle,anticlockwise // x,y 圆心点，radius 半径，从startAngle开始到endAngle结束
ctx.arc(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight), 1, 0, 2 * Math.PI)
ctx.fill() //通过填充路径的内容区域生成实心的图形。
}
},
Refresh() {
this.drawPic();
}
},
watch: {
identifyCode() {
this.drawPic()
}
},
mounted() {
this.drawPic()
}
}
</script>
2.登录组件
<template>
<div>
<el-form-item prop="sidentify">
<el-col :span="14">
<el-input placeholder="请输入验证码" type="text" v-model="yzm" ></el-input>
</el-col>
<el-col :span="8">
<v-sidentify @getData="getData"></v-sidentify>
</el-col>
</el-form-item>
</div>
</template>
<script>
import Sidentify from './yzm.vue' //**引入验证码组件**
export default {
name: 'Login',
data() {
return {
ruleForm: {
usr_name: '',
usr_password: '',
}
}
},
components: {
'v-sidentify':Sidentify ,
},
methods: {
getData(date){
},
}
</script>
标签：vue,ctx,验证码,randomNum,let,contentWidth,contentHeight,Math,图片 来源： https://blog.csdn.net/weixin_58670730/article/details/122820248