引入此js内容
!(function(window, document) {
var size = 4; //设置验证码长度
function GVerify(options) {
//创建一个图形验证码对象,接收options对象为参数
this.options = {
//默认options参数值
id: ‘’, //容器Id
canvasId: ‘verifyCanvas’, //canvas的ID
width: ‘100’, //默认canvas宽度
height: ‘30’, //默认canvas高度
type: ‘blend’, //图形验证码默认类型blend:数字字母混合类型、number:纯数字、letter:纯字母
code: ‘’
};
if (Object.prototype.toString.call(options) == ‘[object Object]’) {
//判断传入参数类型
for (var i in options) {
//根据传入的参数,修改默认参数值
this.options[i] = options[i];
}
} else {
this.options.id = options;
}
this.options.numArr = '0,1,2,3,4,5,6,7,8,9'.split(',');
this.options.letterArr = getAllLetter();
this._init();
this.refresh();
}
GVerify.prototype = {
/版本号/
version: ‘1.0.0’,
/**初始化方法**/
_init: function() {
var con = document.getElementById(this.options.id);
var canvas = document.createElement('canvas');
this.options.width = con.offsetWidth > 0 ? con.offsetWidth : '100';
this.options.height = con.offsetHeight > 0 ? con.offsetHeight : '30';
canvas.id = this.options.canvasId;
canvas.width = this.options.width;
canvas.height = this.options.height;
canvas.style.cursor = 'pointer';
canvas.innerHTML = '您的浏览器版本不支持canvas';
con.appendChild(canvas);
var parent = this;
canvas.onclick = function() {
parent.refresh();
};
},
/**生成验证码**/
refresh: function() {
this.options.code = '';
var canvas = document.getElementById(this.options.canvasId);
if (canvas.getContext) {
var ctx = canvas.getContext('2d');
} else {
return;
}
ctx.textBaseline = 'middle';
ctx.fillStyle = randomColor(180, 240);
ctx.fillRect(0, 0, this.options.width, this.options.height);
// let txtArr;
if (this.options.type == 'blend') {
//判断验证码类型
var txtArr = this.options.numArr.concat(this.options.letterArr);
} else if (this.options.type == 'number') {
var txtArr = this.options.numArr;
} else {
var txtArr = this.options.letterArr;
}
for (var i = 1; i <= size; i++) {
var txt = txtArr[randomNum(0, txtArr.length)];
this.options.code += txt;
ctx.font =
randomNum(this.options.height / 2, this.options.height) + 'px SimHei'; //随机生成字体大小
ctx.fillStyle = randomColor(50, 160); //随机生成字体颜色
ctx.shadowOffsetX = randomNum(-3, 3);
ctx.shadowOffsetY = randomNum(-3, 3);
ctx.shadowBlur = randomNum(-3, 3);
ctx.shadowColor = 'rgba(0, 0, 0, 0.3)';
var x = (this.options.width / (size + 1)) * i;
var y = this.options.height / 2;
var deg = randomNum(-30, 30);
/**设置旋转角度和坐标原点**/
ctx.translate(x, y);
ctx.rotate((deg * Math.PI) / 180);
ctx.fillText(txt, 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 < 4; i++) {
ctx.strokeStyle = randomColor(40, 180);
ctx.beginPath();
ctx.moveTo(
randomNum(0, this.options.width),
randomNum(0, this.options.height)
);
ctx.lineTo(
randomNum(0, this.options.width),
randomNum(0, this.options.height)
);
ctx.stroke();
}
/**绘制干扰点**/
for (var i = 0; i < this.options.width / 4; i++) {
ctx.fillStyle = randomColor(0, 255);
ctx.beginPath();
ctx.arc(
randomNum(0, this.options.width),
randomNum(0, this.options.height),
1,
0,
2 * Math.PI
);
ctx.fill();
}
},
/**验证验证码**/
validate: function(code) {
console.log(code, 'code');
var code = code.toLowerCase();
var v_code = this.options.code.toLowerCase();
if (code == v_code) {
return true;
} else {
this.refresh();
return false;
}
}
};
/生成字母数组/
function getAllLetter() {
var letterStr =
‘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’;
return letterStr.split(’,’);
}
/生成一个随机数/
function randomNum(min, max) {
return Math.floor(Math.random() * (max - min) + min);
}
/生成一个随机色/
function randomColor(min, max) {
var r = randomNum(min, max);
var g = randomNum(min, max);
var b = randomNum(min, max);
return ‘rgb(’ + r + ‘,’ + g + ‘,’ + b + ‘)’;
}
window.GVerify = GVerify;
})(window, document);
使用 在dom中
//引入js 创建图形验证码 { validate }
this.verifyCode = new GVerify(‘v_cont’);
//验证图形验证码是否和输入内容一致
let isVerify = this.verifyCode.validate(this.formLabel.verifyCode);
if (!isVerify) {
this.$message.warning(‘图形验证码错误’);
return isVerify;
}