获取浏览器随机设备号

get _t(){

let sArr =window.navigator.userAgent.toLowerCase().replace(/\s+/g,'').split('');//去除空格之后  用空格分割

    let t ='/_'+Date.parse(new Date());

    return sArr.sort(()=> Math.random() -0.5).join('')+t;

}

获取随机字符串

function (length) {

let str ="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789",

        s ='';

    while (length--) {

let rand = Math.round(Math.random() * str.length);

        s += str.charAt(rand);

    }

return s;

}