Optimize uuid

src/util/index.js

@@ -38,10 +38,10 @@ export function getPointDistance (pointOne, pointTwo) {
   return Math.sqrt(minusX * minusX + minusY * minusY)
 }
 
-export function uuid () {
-  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
+export function uuid (hasHyphen) {
+  return (hasHyphen ? 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx' : 'xxxxxxxxxxxx4xxxyxxxxxxxxxxxxxxx').replace(/[xy]/g, function (c) {
 		const r = Math.random() * 16 | 0
 		const v = c == 'x' ? r : (r & 0x3 | 0x8)
 		return v.toString(16)
-	})
+  })
 }