react-captcha-code
Version:
基于React和canvas的验证码
109 lines (108 loc) • 4.72 kB
JavaScript
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var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, 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 = react_1.forwardRef(function (_a, ref) {
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, onClick = _a.onClick, className = _a.className, onRef = _a.onRef, _g = _a.code, code = _g === void 0 ? '' : _g;
var canvas = react_1.useRef(null);
react_1.useEffect(function () {
onRef && onRef(canvas);
}, []);
react_1.useImperativeHandle(ref, function () { return ({
refresh: function () {
canvas.current.click();
},
}); });
// 生成原始的数据
var generateSourceCode = react_1.useCallback(function () {
var array = [];
if (code) {
return code.split('');
}
for (var i = 0; i < charNum; i++) {
var temp = utils_1.originalCharacter[utils_1.randomNum(0, utils_1.originalCharacter.length - 1)];
array.push(temp);
}
return array;
}, [code, charNum]);
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);
var sourceCode = generateSourceCode();
for (var i = 0; i < sourceCode.length; i++) {
var charGap = Math.round(width / charNum);
var offset = Math.round(charGap / 2) - 6;
var code_1 = sourceCode[i];
checkCode += code_1;
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_1, 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 '';
}
}, [code]);
var handleClick = react_1.useCallback(function () {
if (lodash_1.isFunction(onChange) && !code) {
var captcha = generateCaptcha();
onChange(captcha);
}
if (lodash_1.isFunction(onClick)) {
onClick();
}
}, [onChange, code]);
react_1.useEffect(function () {
var captcha = generateCaptcha();
if (lodash_1.isFunction(onChange) && !code) {
onChange(captcha);
}
}, [code]);
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;