canvas指纹追踪技术

通过canvas生成一个base64的字符串对于设备、操作系统、浏览器生成的

function uuid() {
    const canvas = document.createElement('canvas');
    const ctx = canvas.getContext('2d');
    const txt = 'test';
    ctx.fillText(txt,10,10);
    console.log(canvas.toDataURL())
}