react-captcha-code-li
Version:
基于React和canvas的验证码，不包含0,1,L,O
61 lines (60 loc) • 2.64 kB
JavaScript
import React, { useRef, useEffect, useCallback } from 'react';
import * as S from './style';
import { originalCharacter, randomColor, randomNum } from './utils';
import { isFunction } from 'lodash';
import cs from 'classnames';
var Captcha = function (_a) {
var _b = _a.height, height = _b === void 0 ? 40 : _b, _c = _a.width, width = _c === void 0 ? 100 : _c, _d = _a.bgColor, bgColor = _d === void 0 ? '#DFF0D8' : _d, _e = _a.charNum, charNum = _e === void 0 ? 4 : _e, _f = _a.fontSize, fontSize = _f === void 0 ? 25 : _f, onChange = _a.onChange, className = _a.className;
var canvas = useRef(null);
var generateCaptcha = useCallback(function () {
var checkCode = '';
if (canvas.current) {
var ctx = canvas.current.getContext('2d');
if (ctx) {
ctx.clearRect(0, 0, width, height);
ctx.beginPath();
ctx.fillStyle = bgColor;
ctx.fillRect(0, 0, width, height);
for (var i = 0; i < charNum; i++) {
var charGap = Math.round(width / charNum);
var offset = Math.round(charGap / 2) - 6;
var code = originalCharacter[randomNum(0, originalCharacter.length - 1)];
checkCode += code;
ctx.save();
ctx.beginPath();
ctx.fillStyle = "white";
ctx.strokeStyle = randomColor();
ctx.font = fontSize + "px serif";
ctx.rotate((Math.PI / 180) * randomNum(-5, 5));
ctx.strokeText(code, offset + i * charGap, height / 2 + 8);
ctx.beginPath();
ctx.moveTo(randomNum(0, width), randomNum(0, height));
ctx.lineTo(randomNum(0, width), randomNum(0, height));
ctx.stroke();
ctx.restore();
}
return checkCode;
}
else {
return '';
}
}
else {
return '';
}
}, []);
var handleClick = useCallback(function () {
if (isFunction(onChange)) {
var captcha = generateCaptcha();
onChange(captcha);
}
}, [onChange]);
useEffect(function () {
if (isFunction(onChange)) {
var captcha = generateCaptcha();
onChange(captcha);
}
}, []);
return (React.createElement(S.SCaptcha, { className: cs('react-captcha', className), onClick: handleClick, height: height, width: width, ref: canvas }));
};
export default Captcha;