js在前端自动生成uuid的方法

页面只需要引入，然后直接调用generateUUID（）即可

export const generateUUID = () => {
    var d = new Date().getTime();
    if (window.performance && typeof window.performance.now === "function") {
        d += performance.now(); //use high-precision timer if available
    }
    var uuid = "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, function (c) {
        var r = (d + Math.random() * 16) % 16 | 0;
        d = Math.floor(d / 16);
        return (c == "x" ? r : (r & 0x3) | 0x8).toString(16);
    });
    return uuid;
};