需求
前端实现验证码输入
封装
本质绘制随机数，并进行校验
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: '100%', // 默认canvas高度
type: 'number', // 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 : '30'
// this.options.height = con.offsetHeight > 0 ? con.offsetHeight : '30'
this.options.width = con.offsetWidth
this.options.height = '40'
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() { 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') { // eslint-disable-next-line no-redeclare
var txtArr = this.options.numArr
} else { // eslint-disable-next-line no-redeclare
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**/
// eslint-disable-next-line no-redeclare
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**/
// eslint-disable-next-line no-redeclare
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) { // eslint-disable-next-line no-redeclare
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
}
使用
import { GVerify } from './component/GVerify'
// element的自定义校验验证码
const rightCode = (rule, value, callback) => { if (value) { const verifyFlag = this.verifyCode.validate(value)
if (!verifyFlag) { callback(new Error('请输入正确的验证码'))
} else { callback()
}
} else { callback()
}
}
rules: {···
code: [
{ required: true, message: '请输入验证码', trigger: 'blur' },
{ required: true, trigger: 'blur', validator: rightCode }
]
},
mounted() { this.verifyCode = new GVerify('v_container')
},
如果登录失败 使用 验证码刷新this.verifyCode.refresh()
拓展：变成加减乘的格式（0-10以内）
如果想做成加减乘那种只需要在代码中进行修改 校验函数和绘制函数即可
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: '100%', // 默认canvas高度
type: 'number', // 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 : '30'
// this.options.height = con.offsetHeight > 0 ? con.offsetHeight : '30'
this.options.width = con.offsetWidth
this.options.height = '40'
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() { 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') { // eslint-disable-next-line no-redeclare
var txtArr = this.options.numArr
} else { // eslint-disable-next-line no-redeclare
var txtArr = this.options.letterArr
}
this.options.code = []
for (var i = 1; i <= 3; i++) { var txt = txtArr[randomNum(0, txtArr.length)]
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)
// 中间符号
if (i === 2) { const index = randomNum(0, 3)
const fuhao = ['+', '-', '*'][index]
console.log(fuhao)
ctx.fillText(fuhao, 0, 0)
this.options.code.push(fuhao)
} else { ctx.fillText(txt, 0, 0)
this.options.code.push(Number(txt))
}
/** 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**/
// eslint-disable-next-line no-redeclare
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**/
// eslint-disable-next-line no-redeclare
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) { // eslint-disable-next-line no-redeclare
var code = Number(code)
var v_code
if (this.options.code[1] === '-') { v_code = this.options.code[0] - this.options.code[2]
} else if (this.options.code[1] === '+') { v_code = this.options.code[0] + this.options.code[2]
} else if (this.options.code[1] === '*') { v_code = this.options.code[0] * this.options.code[2]
}
console.log(this.options.code, v_code, code)
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
}
