<template>
<canvas id="canvas" @click="showNum" width="138" height="36"></canvas>
</template>
<script>
export default {
name: "Verification",
data() {
return {
num: [],
number: '',
}
},
mounted(){
this.draw(this.num);
this.number =this.num.join().replace(/,/g,'');
},
methods: {
/*点击更换-验证码*/
showNum(){
this.draw(this.num);
this.number =this.num.join().replace(/,/g,'');
},
draw(num) {
let canvas_width=138;
let canvas_height=36;
let canvas =document.getElementById("canvas");//获取到canvas的对象,演员
let context =canvas.getContext("2d");//获取到canvas画图的环境,演员表演的舞台
canvas.width =canvas_width;
canvas.height =canvas_height;
let sCode ="A,B,C,D,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,Y,Z,1,2,3,4,5,6,7,8,9,0";
let aCode =sCode.split(",");
let aLength =aCode.length;//获取到数组的长度
for (let i =0;i <=3;i++) {
let j =Math.floor(Math.random() *aLength);//获取到随机的索引值
let deg =Math.random() *15 *Math.PI /180;//产生0~30之间的随机弧度
let txt =aCode[j];//得到随机的一个内容
//num[i] = txt.toLowerCase(); toUpperCase()
num[i] =txt;
let x =20 +i *30;//文字在canvas上的x坐标
let y =20 +Math.random() *8;//文字在canvas上的y坐标
context.font ="bold 23px 微软雅黑";
context.translate(x,y);
context.rotate(deg);
context.fillStyle =this.randomColor();
context.fillText(txt,0,0);
context.rotate(-deg);
context.translate(-x, -y);
}
for (let i =0;i <=5;i++) {//验证码上显示线条
context.strokeStyle =this.randomColor();
context.beginPath();
context.moveTo(Math.random() *canvas_width,Math.random() *canvas_height);
context.lineTo(Math.random() *canvas_width,Math.random() *canvas_height);
context.stroke();
}
for (let i =0;i <=30;i++) {//验证码上显示小点
context.strokeStyle =this.randomColor();
context.beginPath();
let x =Math.random() *canvas_width;
let y =Math.random() *canvas_height;
context.moveTo(x,y);
context.lineTo(x +1,y +1);
context.stroke();
}
},
//得到随机的颜色值
randomColor() {
let r =Math.floor(Math.random() *256);
let g =Math.floor(Math.random() *256);
let b =Math.floor(Math.random() *256);
return "rgb(" +r +"," +g +"," +b +")";
},
}
}
</script>
<style scoped>
</style>
<template>
<div>
<Verification ref="verification_code"></Verification>
</div>
</template>
<script>
import Verification from '@/components/Verification'
export default {
name: "index",
components:{
Verification,
},
data() {
return {
}
},
mounted() {
console.log(this.$refs.verification_code.number);
},
}
</script>
<style scoped>
</style>
参考博客: