浏览器指纹.js

function getUUID() {
  const canvas = document.createElement('canvas');
  const ctx = canvas.getContext('2d');
  ctx.fillStyle = '#ff0000';
  ctx.fillRect(0,0,8,10);
  const b64 = canvas.toDataURL().replace('data:image/png;base64,', '');
  const bin = window.atob(b64);
  return bin2hex(bin.slice(-16, -12));
}

function bin2hex(s){  
    // Converts the binary representation of data to hex    
    //   
    // version: 812.316  
    // discuss at: http://phpjs.org/functions/bin2hex  
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)  
    // +   bugfixed by: Onno Marsman  
    // +   bugfixed by: Linuxworld  
    // *     example 1: bin2hex('Kev');  
    // *     returns 1: '4b6576'  
    // *     example 2: bin2hex(String.fromCharCode(0x00));  
    // *     returns 2: '00'  
    var v,i, f = 0, a = [];  
    s += '';  
    f = s.length;  
      
    for (i = 0; i<f; i++) {  
        a[i] = s.charCodeAt(i).toString(16).replace(/^([\da-f])$/,"0$1");  
    }  
      
    return a.join('');  
}