tyrcode-captcha/captcha.js

仿写验证码

/**
 * 随机生成SVG验证码
 * @returns Object
 */

 function create(color1='grey',color2='black',footsize='16')
 {
   let str = '0123456789abcdeJKNBVfghiFYTUGIHKkdsfFHGHKJas'
   let one = Math.floor( Math.random() * (str.length-1-0+1)+0 )
   let two = Math.floor( Math.random() * (str.length-1-0+1)+0 )
   let three = Math.floor( Math.random() * (str.length-1-0+1)+0 )
   let four = Math.floor( Math.random() * (str.length-1-0+1)+0 )
   let text = '' + str[one] + str[two] + str[three] + str[four]  
   return {
       text,
       data: `<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="100px" height="50px" style="background:${color1}">
       <text x="30" y="30" font-size="${footsize}px" fill=${color2} stroke="black">${text}</text>
     </svg>`
   }
 }
 
 module.exports = {
     create,
 }