【js UUID】JS生成UUID 使用

 * 生成UUID
 * @returns
 */
function UUID() {
        var s = [];
        var hexDigits = "0123456789abcdef";
        for (var i = 0; i < 36; i++) {
            s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);
        }
        s[14] = "4"; 
        s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1); 
                                                            
        s[8] = s[13] = s[18] = s[23] = "-";

        var uuid = s.join("");
        return uuid;
    }