Nodejs Bit Shift shift(bit)

Here you can find the source of shift(bit)

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Method Source Code

Number.prototype.shift = function (bit) {
    return parseInt(this * (2 << bit));
};

function getSec () {
    return Date.parse(new Date()) / 1000 - 1420041600;
}

function getYmd () {
    return (new Date()).toISOString().slice(2, 10).replace(/-/g, '');
}
let doc = {'seid': 1};


var csid = getSec().shift(10)  + parseInt(doc.seid % 1000);
console.log(csid);// ww w. ja  va  2  s. c om