本文实例为大家分享了vue实现web前端登录页数字验证码的具体代码，供大家参考，具体内容如下
1.创建code.js文件夹下面是js代码
function gverify(options) {
console.log(); // 创建一个图形验证码对象，接收options对象为参数
this.con = document.getelementbyid(options)
this.options = { // 默认options参数值
id: '', // 容器id
canvasid: 'verifycanvas', // canvas的id
width: this.con.offsetwidth, // 默认canvas宽度
height: this.con.offsetheight, // 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 canvas = document.createelement('canvas')
canvas.id = this.options.canvasid
let { width, height } = this.options
canvas.width = width
canvas.height = height
canvas.style.cursor = 'pointer'
canvas.innerhtml = '您的浏览器版本不支持canvas'
this.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
}
this.options.code = ''
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
}
2.code.js在组件中引入
3.在data中定义如下两个属性
value:"", verifycode: "",
4.在mounted中执行方法
mounted(){
this.verifycode = new gverify("auth_code");
},
5.在template中定义div需要给div设置宽高
<div id="auth_code"></div>
6.在登录请求前进行判断成功向下执行,失败return并同时执行this.verifycode.refresh()方法切换验证码，同时按照逻辑 在登录失败账号或密码错误时也需要执行this.verifycode.refresh()切换验证码
if(this.verifycode.validate(this.value)){
}else{
this.$message({
message: "验证码错误",
type: 'warning'
});
this.verifycode.refresh();
return
}
7.效果图
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
