1. Download identify plug-in and install NPM

npm i identify
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2. Create a new sidentify. vue in your Components directory and copy the following code into it.

<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: 35 }, fontSizeMax: { type: Number, default: 35 }, backgroundColorMin: { type: Number, default: 180 }, backgroundColorMax: { type: Number, default: 240 }, colorMin: { type: Number, default: 50 }, colorMax: { type: Number, default: 160 }, lineColorMin: { type: Number, default: 100 }, lineColorMax: { type: Number, default: 200 }, dotColorMin: { type: Number, default: 0 }, dotColorMax: { type: Number, default: 255 }, contentWidth: { type: Number, default: 120 }, contentHeight: { type: Number, default: 40 } }, methods: {// Generate a random number randomNum(min, Max) {return math.floor (math.random () * (max-min) + min); }, // generate a randomColor 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 + ")"; }, transparent() {return "RGB (255,255,255)"; }, drawPic() { let canvas = document.getElementById("s-canvas"); let ctx = canvas.getContext("2d"); ctx.textBaseline = "bottom"; / / draw the background / / CTX fillStyle = this. RandomColor (. / / this backgroundColorMin, / / this. BackgroundColorMax / /); ctx.fillStyle = this.transparent(); ctx.fillRect(0, 0, this.contentWidth, this.contentHeight); // Draw text for (let I = 0; i < this.identifyCode.length; i++) { this.drawText(ctx, this.identifyCode[i], i); 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(-10, 10); // Change the origin and rotation Angle ctx.translate(x, y); ctx.rotate((deg * Math.PI) / 180); ctx.fillText(txt, 0, 0); Rotate ((-deg * math.pi) / 0); rotate((-deg * math.pi) / 0); ctx.translate(-x, -y); }, drawLine(CTX) {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) {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>Copy the code

3. Introduce components and write methods to pages where you need captchas

<template> <div class="get-code" @click="refreshCode()"> <s-identify :identifyCode="identifyCode"></s-identify> </div> </template> <script> import SIdentify from "@/components/SIdentify.vue"; export default { components: { SIdentify }, data() { return { identifyCode: "", identifyCodes: "0123456789 abcdwerwshdjejkdhrjhkooplmkq", / / draw a random number}}, created () {enclosing refreshCode ()}, the methods: { refreshCode() { this.identifyCode = ""; this.makeCode(this.identifyCodes,4); }, randomNum (min, max) { max = max + 1 return Math.floor(Math.random() * (max - min) + min) }, MakeCode (data, len) {for (let I = 0; i < len; i++) { this.identifyCode += data[this.randomNum(0, data.length - 1)] } } } </script>Copy the code

4, complete the renderings (if background is needed, open the annotation of drawing background code in the component)