取代cookie的网站追踪技术
我使用了下列代码来识别访问的人，但我的老板说还不够精确，是否增加txt的字符数和增加canvas的尺寸可以提高识别精确度啊？http://www.tuicool.com/articles/JNJjMjm
var canvas = document.createElement('canvas');
var ctx = canvas.getContext('2d');
var txt = 'http://security.tencent.com/';
ctx.textBaseline = "top";
ctx.font = "14px 'Arial'";
ctx.textBaseline = "tencent";
ctx.fillStyle = "#f60";
ctx.fillRect(125,1,62,20);
ctx.fillStyle = "#069";
ctx.fillText(txt, 2, 15);
ctx.fillStyle = "rgba(102, 204, 0, 0.7)";
ctx.fillText(txt, 4, 17);
var b64 = canvas.toDataURL().replace("data:image/png;base64,","");
var bin = atob(b64);
var crc = bin2hex(bin.slice(-16,-12)); 最后我还是用了下面的连接
https://github.com/Valve/fingerprintjs
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