vue系列---identify(生成图片验证码)插件
identify
这是一个vue的插件,使用canvas来生成图形验证码。
具体参数如下:
identify.vue组件(主要用于定义参数和方法)
<template> <div class="s-canvas"> <canvas id="s-canvas" :width="contentWidth" :height="contentHeight"></canvas> </div> </template> <script> export default{ name: 'SIdentify', props: { identifyCode: { type: String, default: '1234' }, fontSizeMin: { type: Number, default: 16 }, fontSizeMax: { type: Number, default: 40 }, backgroundColorMin: { type: Number, default: 180 }, backgroundColorMax: { type: Number, default: 240 }, colorMin: { type: Number, default: 50 }, colorMax: { type: Number, default: 160 }, lineColorMin: { type: Number, default: 40 }, lineColorMax: { type: Number, default: 180 }, dotColorMin: { type: Number, default: 0 }, dotColorMax: { type: Number, default: 255 }, contentWidth: { type: Number, default: 112 }, contentHeight: { type: Number, default: 38 } }, methods: { // 生成一个随机数 randomNum (min, max) { return Math.floor(Math.random() * (max - min) + min) }, // 生成一个随机的颜色 randomColor (min, max) { let r = this.randomNum(min, max) let g = this.randomNum(min, max) let b = this.randomNum(min, max) return 'rgb(' + r + ',' + g + ',' + b + ')' }, drawPic () { let canvas = document.getElementById('s-canvas') let ctx = canvas.getContext('2d') ctx.textBaseline = 'bottom' // 绘制背景 ctx.fillStyle = this.randomColor(this.backgroundColorMin, this.backgroundColorMax) ctx.fillRect(0, 0, this.contentWidth, this.contentHeight) // 绘制文字 for (let i = 0; i < this.identifyCode.length; i++) { this.drawText(ctx, this.identifyCode[i], i) } this.drawLine(ctx) this.drawDot(ctx) }, drawText (ctx, txt, i) { ctx.fillStyle = this.randomColor(this.colorMin, this.colorMax) ctx.font = this.randomNum(this.fontSizeMin, this.fontSizeMax) + 'px SimHei' let x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1)) let y = this.randomNum(this.fontSizeMax, this.contentHeight - 5) var deg = this.randomNum(-45, 45) // 修改坐标原点和旋转角度 ctx.translate(x, y) ctx.rotate(deg * Math.PI / 180) ctx.fillText(txt, 0, 0) // 恢复坐标原点和旋转角度 ctx.rotate(-deg * Math.PI / 180) ctx.translate(-x, -y) }, drawLine (ctx) { // 绘制干扰线 for (let i = 0; i < 8; i++) { ctx.strokeStyle = this.randomColor(this.lineColorMin, this.lineColorMax) ctx.beginPath() ctx.moveTo(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight)) ctx.lineTo(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight)) ctx.stroke() } }, drawDot (ctx) { // 绘制干扰点 for (let i = 0; i < 100; i++) { ctx.fillStyle = this.randomColor(0, 255) ctx.beginPath() ctx.arc(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight), 1, 0, 2 * Math.PI) ctx.fill() } } }, watch: { identifyCode () { this.drawPic() } }, mounted () { this.drawPic() } } </script>
login.vue(在页面进行使用):
<template> <div class="code" @click="refreshCode"> <s-identify :identifyCode="identifyCode"></s-identify> </div> </template> <script>
import SIdentify from '@/components/public/identify/identify'
export default { name: "codetest",
components: {
Footer,
SIdentify
},
data() { return { identifyCodes: "1234567890", identifyCode: "" }; }, mounted() { this.identifyCode = ""; this.makeCode(this.identifyCodes, 4); }, methods: { randomNum(min, max) { return Math.floor(Math.random() * (max - min) + min); }, refreshCode() { this.identifyCode = ""; this.makeCode(this.identifyCodes, 4); }, makeCode(o, l) { for (let i = 0; i < l; i++) { this.identifyCode += this.identifyCodes[ this.randomNum(0, this.identifyCodes.length) ]; } console.log(this.identifyCode); } } }; </script> <style> .code { margin: 400px auto; width: 114px; height: 40px; border: 1px solid red; } </style>
注意图片验证码的宽高是由参数 contentWidth 和 contentHeight 决定的,所以更改宽高的时候,直接在声明的参数中进行更改就可。
测试效果:
浩楠哥