效果图：
点击图片也会刷新图片
代码：index.js
import React, { Component } from 'react'
import styles from './index.less';
class First extends Component {
constructor(props) {
super(props)
this.state = {
code: ''
}
}
componentDidMount() {
this.createCode()
}
createCode = () => {
//定义验证码的宽高，干扰点数量，干扰线数量
const width = 100
const height = 60
const points = 50
const line = 4
//生成随机数
function randomNum(min, max) {
return Math.floor(Math.random() * (max - min) + min);
}
//随机颜色
function randomColor(min, max) {
var r = randomNum(min, max);
var g = randomNum(min, max);
var b = randomNum(min, max);
return `rgb(${r},${g},${b})`;
}
const ctx = this.canvas.getContext('2d')
const chars = [1, 2, 3, 4, 5, 6, 7, 8, 9, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'l', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
let code = ''
ctx.clearRect(0, 0, width, height)
// 绘制四个验证数码
for (let i = 0; i < 4; i++) {
const char = chars[randomNum(0, 57)]
code += char
ctx.font = randomNum(20, 25) + 'px SimHei' //设置字体随机大小
ctx.fillStyle = randomColor(0, 255) //设置字体随机颜色
ctx.textBaseline = 'middle'
ctx.shadowOffsetX = randomNum(-3, 3)
ctx.shadowOffsetY = randomNum(-3, 3)
ctx.shadowBlur = randomNum(-3, 3)
ctx.shadowColor = 'rgba(0, 0, 0, 0.3)'
let x = width / 5 * (i + 1)
let y = height / 2
let deg = randomNum(-25, 25)
/**设置旋转角度和坐标原点**/
ctx.translate(x, y)
ctx.rotate(deg * Math.PI / 180)
ctx.fillText(char, 0, 0)
/**恢复旋转角度和坐标原点**/
ctx.rotate(-deg * Math.PI / 180)
ctx.translate(-x, -y)
}
//绘制干扰线
for (var i = 0; i < line; i++) {
ctx.strokeStyle = randomColor(0, 255);
ctx.beginPath();
ctx.moveTo(randomNum(0, width), randomNum(0, height));
ctx.lineTo(randomNum(0, width), randomNum(0, height));
ctx.stroke();
}
//绘制干扰点
for (var i = 0; i < points; i++) {
ctx.fillStyle = randomColor(0, 255);
ctx.beginPath();
ctx.arc(randomNum(0, width), randomNum(0, height), 1, 0, 2 * Math.PI);
ctx.fill();
}
this.setState({
code
})
}
render() {
return (
<div className={styles.imageCodeWrapper}>
<div className={styles.canvas}>
<canvas onClick={this.createCode} width="100" height='60' ref={el => this.canvas = el} />
</div>
</div>
)
}
}
export default First
index.less
.canvas{
background-color: rgba(0, 0, 0, 0.1);
height: 60px;
width: 100px;
display: inline-block;
}
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