react-captcha-code-li
Version:
基于React和canvas的验证码，不包含0,1,L,O
73 lines (72 loc) • 3.28 kB
JavaScript
;
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
result["default"] = mod;
return result;
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var react_1 = __importStar(require("react"));
var S = __importStar(require("./style"));
var utils_1 = require("./utils");
var lodash_1 = require("lodash");
var classnames_1 = __importDefault(require("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 = react_1.useRef(null);
var generateCaptcha = react_1.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 = utils_1.originalCharacter[utils_1.randomNum(0, utils_1.originalCharacter.length - 1)];
checkCode += code;
ctx.save();
ctx.beginPath();
ctx.fillStyle = "white";
ctx.strokeStyle = utils_1.randomColor();
ctx.font = fontSize + "px serif";
ctx.rotate((Math.PI / 180) * utils_1.randomNum(-5, 5));
ctx.strokeText(code, offset + i * charGap, height / 2 + 8);
ctx.beginPath();
ctx.moveTo(utils_1.randomNum(0, width), utils_1.randomNum(0, height));
ctx.lineTo(utils_1.randomNum(0, width), utils_1.randomNum(0, height));
ctx.stroke();
ctx.restore();
}
return checkCode;
}
else {
return '';
}
}
else {
return '';
}
}, []);
var handleClick = react_1.useCallback(function () {
if (lodash_1.isFunction(onChange)) {
var captcha = generateCaptcha();
onChange(captcha);
}
}, [onChange]);
react_1.useEffect(function () {
if (lodash_1.isFunction(onChange)) {
var captcha = generateCaptcha();
onChange(captcha);
}
}, []);
return (react_1.default.createElement(S.SCaptcha, { className: classnames_1.default('react-captcha', className), onClick: handleClick, height: height, width: width, ref: canvas }));
};
exports.default = Captcha;