js 隨機數獲取

/**js 隨機數獲取**/
function S4() {
   return (((1+Math.random())*0x10000)|0).toString(16).substring(1);
}
function uuid() {
   return (S4()+""+S4()+"-"+S4()+""+S4()+"-"+S4()+""+S4()+"-"+S4()+""+S4());
}