vue2动态生成（绘制）图形验证码（验证码图片）
方案1：js绘制条形验证码
参考文档：https://blog.csdn.net/LOVE_mingjing/article/details/130622848
utils文件夹下新建GVerify.js文件：
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: "80", // 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 = "140";
this.options.height = "56";
canvas.id = this.options.canvasId;
canvas.width = this.options.width;
canvas.height = this.options.height;
canvas.style.cursor = "pointer";
canvas.innerHTML = "浏览器不支持canvas";
con.appendChild(canvas);
var parent = this;
canvas.onclick = function () {
parent.refresh();
};
},
/** 生成验证码**/
refresh: function () {
var canvas = document.getElementById(this.options.canvasId);
if (canvas.getContext) {
var ctx = canvas.getContext("2d");
}
ctx.textBaseline = "middle";
ctx.fillStyle = randomColor(180, 240);
ctx.fillRect(0, 0, this.options.width, this.options.height);
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 <= 4; 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 / 5) * 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) {
var code = code.toLowerCase();
var v_code = this.options.code.toLowerCase();
if (code == v_code) {
return true;
} else {
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 + ")";
}
export { GVerify };
可以手动修改内容类型、长度等等，支持手动刷新
使用方式：
1.组件中自行配置样式：
<div :class="$style.verifyBox" v-show="verifyVisible">
<input
type="text"
maxlength="4"
:class="[$style.verifyInput]"
v-model="userCode"
/>
<div id="v_container" @click="btncode"></div>
<button @click="xxxxVerifyCode">提交</button>
</div>
2.引入文件：
import { GVerify } from "@/utils/GVerify.js";
data() {
return {
verifyCode: "",
imgData: "", // 验证码
userCode: "", // 用户填写的动态验证码
};
},
3.methods中配置刷新与校验的方法：
// 获取动态验证码
btncode() {
this.imgData = this.verifyCode.options.code.substr(
this.verifyCode.options.code.length - 4
);
},
// 校验动态验证码
xxxxVerifyCode() {
var userCode = this.userCode.toLowerCase();
var v_code = this.verifyCode.options.code.substr(this.verifyCode.options.code.length - 4).toLowerCase();
if(userCode === v_code){
alert('duile')
}
},
4.mounted或逻辑中调用：
this.verifyCode = new GVerify("v_container");
this.imgData = this.verifyCode.options.code.substr(this.verifyCode.options.code.length - 4);
this.verifyVisible = true;
效果：
方案2：使用插件vue2-verify
参考文档（随便找的，网上很多大佬分享）：https://blog.csdn.net/q2724338648/article/details/134488798
此插件提供了5种验证码样式，有最常见的图形验证码，还有滑动验证码、拼图验证码、计算验证码、填块验证码，样式可以自行覆盖，封装较完善
效果：
使用方法：
【这里用了普通条形验证码，其余4种文档中有列出参数】
1.npm引入插件：
npm i vue2-verify
2.组件中调用：
<verify
@success="onVerifySuccess"
@error="onVerifyError"
:type="1"
:codeLength="4"
></verify>
3.文件中引入：
import Verify from "vue2-verify";
data() {
return {
verifyVisible: false,
};
},
components: { Verify, },
4.methoed中配置校验方法即可：
onVerifySuccess(obj) {
//验证码正确回调
setTimeout(() => {
this.verifyVisible = false;
this.onClick(this.verifyCode);
}, 300);
},
onVerifyError(obj) {
//验证码错误回调
console.log("verify error");
//错误刷新验证码
obj.refresh();
},
p.s.不过滑块验证体验稍微有些不好，遂放弃使用
浙公网安备 33010602011771号