生成uuid

const genUUID = () => ([1e7].toString() + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, (c) =>
    (parseInt(c, 10) ^ (window.crypto.getRandomValues(new Uint32Array(1))[0] & (15 >> (parseInt(c, 10) / 4)))).toString(16)
);

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