134 lines
4.6 KiB
JavaScript
134 lines
4.6 KiB
JavaScript
function GVerify (options) { // 创建一个图形验证码对象，接收options对象为参数
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this.options = { // 默认options参数值
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id: '', // 容器Id
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canvasId: 'verifyCanvas', // canvas的ID
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width: '80', // 默认canvas宽度
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height: '30', // 默认canvas高度
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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
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code: ''
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}
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if (Object.prototype.toString.call(options) === '[object Object]') { // 判断传入参数类型
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for (var i in options) { // 根据传入的参数，修改默认参数值
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this.options[i] = options[i]
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}
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} else {
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this.options.id = options
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}
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this.options.numArr = '0,1,2,3,4,5,6,7,8,9'.split(',')
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this.options.letterArr = getAllLetter()
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this._init()
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this.refresh()
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}
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GVerify.prototype = {
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/** 版本号**/
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version: '1.0.0',
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/** 初始化方法**/
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_init: function () {
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var con = document.getElementById(this.options.id)
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var canvas = document.createElement('canvas')
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// this.options.width = con.offsetWidth > 0 ? con.offsetWidth : '30'
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// this.options.height = con.offsetHeight > 0 ? con.offsetHeight : '30'
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this.options.width = '160'
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this.options.height = '50'
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canvas.id = this.options.canvasId
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canvas.width = this.options.width
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canvas.height = this.options.height
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canvas.style.cursor = 'pointer'
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canvas.innerHTML = '您的浏览器版本不支持canvas'
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con.appendChild(canvas)
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var parent = this
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canvas.onclick = function () {
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parent.refresh()
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}
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},
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/** 生成验证码**/
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refresh: function () {
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var canvas = document.getElementById(this.options.canvasId)
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if (canvas.getContext) {
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var ctx = canvas.getContext('2d')
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}
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ctx.textBaseline = 'middle'
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ctx.fillStyle = randomColor(180, 240)
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ctx.fillRect(0, 0, this.options.width, this.options.height)
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if (this.options.type === 'blend') { // 判断验证码类型
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var txtArr = this.options.numArr.concat(this.options.letterArr)
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} else if (this.options.type === 'number') {
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// eslint-disable-next-line no-redeclare
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var txtArr = this.options.numArr
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} else {
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// eslint-disable-next-line no-redeclare
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var txtArr = this.options.letterArr
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}
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for (var i = 1; i <= 4; i++) {
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var txt = txtArr[randomNum(0, txtArr.length)]
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this.options.code += txt
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ctx.font = randomNum(this.options.height / 2, this.options.height) + 'px SimHei' // 随机生成字体大小
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ctx.fillStyle = randomColor(50, 160) // 随机生成字体颜色
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ctx.shadowOffsetX = randomNum(-3, 3)
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ctx.shadowOffsetY = randomNum(-3, 3)
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ctx.shadowBlur = randomNum(-3, 3)
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ctx.shadowColor = 'rgba(0, 0, 0, 0.3)'
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var x = this.options.width / 5 * i
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var y = this.options.height / 2
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var deg = randomNum(-30, 30)
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/** 设置旋转角度和坐标原点**/
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ctx.translate(x, y)
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ctx.rotate(deg * Math.PI / 180)
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ctx.fillText(txt, 0, 0)
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/** 恢复旋转角度和坐标原点**/
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ctx.rotate(-deg * Math.PI / 180)
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ctx.translate(-x, -y)
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}
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/** 绘制干扰线**/
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// eslint-disable-next-line no-redeclare
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for (var i = 0; i < 4; i++) {
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ctx.strokeStyle = randomColor(40, 180)
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ctx.beginPath()
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ctx.moveTo(randomNum(0, this.options.width), randomNum(0, this.options.height))
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ctx.lineTo(randomNum(0, this.options.width), randomNum(0, this.options.height))
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ctx.stroke()
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}
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/** 绘制干扰点**/
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// eslint-disable-next-line no-redeclare
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for (var i = 0; i < this.options.width / 4; i++) {
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ctx.fillStyle = randomColor(0, 255)
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ctx.beginPath()
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ctx.arc(randomNum(0, this.options.width), randomNum(0, this.options.height), 1, 0, 2 * Math.PI)
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ctx.fill()
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}
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},
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/** 验证验证码**/
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validate: function (code) {
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// eslint-disable-next-line no-redeclare
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var code = code.toLowerCase()
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// eslint-disable-next-line camelcase
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var v_code = this.options.code.toLowerCase()
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// eslint-disable-next-line eqeqeq,camelcase
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if (code == v_code) {
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return true
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} else {
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return false
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}
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}
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}
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/** 生成字母数组**/
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function getAllLetter () {
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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'
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return letterStr.split(',')
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}
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/** 生成一个随机数**/
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function randomNum (min, max) {
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return Math.floor(Math.random() * (max - min) + min)
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}
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/** 生成一个随机色**/
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function randomColor (min, max) {
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var r = randomNum(min, max)
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var g = randomNum(min, max)
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var b = randomNum(min, max)
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return 'rgb(' + r + ',' + g + ',' + b + ')'
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}
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export {
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GVerify
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}
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