You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
73 lines
3.0 KiB
JavaScript
73 lines
3.0 KiB
JavaScript
module.exports = class Mcaptcha {
|
|
constructor(options) {
|
|
this.options = options;
|
|
this.fontSize = options.height * 3 / 6;
|
|
this.init();
|
|
this.refresh();
|
|
}
|
|
init() {
|
|
this.ctx = wx.createCanvasContext(this.options.el);
|
|
this.ctx.setTextBaseline("middle");
|
|
this.ctx.setFillStyle(this.randomColor(180, 240));
|
|
}
|
|
refresh() {
|
|
var code = '';
|
|
var txtArr = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
|
|
for (var i = 0; i < 4; i++) {
|
|
code += txtArr[this.randomNum(0, txtArr.length)];
|
|
}
|
|
this.options.createCodeImg = code;
|
|
let arr = (code + '').split('');
|
|
if (arr.length === 0) {
|
|
arr = ['e', 'r', 'r', 'o', 'r'];
|
|
};
|
|
let offsetLeft = this.options.width * 0.6 / (arr.length - 1);
|
|
let marginLeft = this.options.width * 0.2;
|
|
arr.forEach((item, index) => {
|
|
this.ctx.setFillStyle(this.randomColor(0, 180));
|
|
let size = this.randomNum(24, this.fontSize);
|
|
this.ctx.setFontSize(size);
|
|
let dis = offsetLeft * index + marginLeft - size * 0.3;
|
|
let deg = this.randomNum(-30, 30);
|
|
this.ctx.translate(dis, this.options.height * 0.5);
|
|
this.ctx.rotate(deg * Math.PI / 180);
|
|
this.ctx.fillText(item, 0, 0);
|
|
this.ctx.rotate(-deg * Math.PI / 180);
|
|
this.ctx.translate(-dis, -this.options.height * 0.5);
|
|
})
|
|
for (var i = 0; i < 4; i++) {
|
|
this.ctx.strokeStyle = this.randomColor(40, 180);
|
|
this.ctx.beginPath();
|
|
this.ctx.moveTo(this.randomNum(0, this.options.width), this.randomNum(0, this.options.height));
|
|
this.ctx.lineTo(this.randomNum(0, this.options.width), this.randomNum(0, this.options.height));
|
|
this.ctx.stroke();
|
|
}
|
|
for (var i = 0; i < this.options.width / 4; i++) {
|
|
this.ctx.fillStyle = this.randomColor(0, 255);
|
|
this.ctx.beginPath();
|
|
this.ctx.arc(this.randomNum(0, this.options.width), this.randomNum(0, this.options.height), 1, 0, 2 * Math.PI);
|
|
this.ctx.fill();
|
|
}
|
|
this.ctx.draw();
|
|
}
|
|
validate(code) {
|
|
var code = code.toLowerCase();
|
|
var v_code = this.options.createCodeImg.toLowerCase();
|
|
console.log(code)
|
|
console.log(v_code.substring(v_code.length - 4))
|
|
if (code == v_code.substring(v_code.length - 4)) {
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
randomNum(min, max) {
|
|
return Math.floor(Math.random() * (max - min) + min);
|
|
}
|
|
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 + ")";
|
|
}
|
|
} |