JS常用工具代码

（1）生成UUID

function generateUUID() {
var d = new Date().getTime();
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;
};