chore: utils

src/utils/random-num.ts

@@ -0,0 +1,29 @@
+export function randomNum(len: number, radix: number) {
+  const chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');
+  const uuid = [] as string[];
+  radix = radix || chars.length;
+
+  if (len) {
+    // Compact form
+    for (let i = 0; i < len; i++) {
+      uuid[i] = chars[0 | (Math.random() * radix)];
+    }
+  } else {
+    // rfc4122, version 4 form
+    let r;
+
+    // rfc4122 requires these characters
+    uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
+    uuid[14] = '4';
+
+    // Fill in random data.  At i==19 set the high bits of clock sequence as
+    // per rfc4122, sec. 4.1.5
+    for (let i = 0; i < 36; i++) {
+      if (!uuid[i]) {
+        r = 0 | (Math.random() * 16);
+        uuid[i] = chars[i === 19 ? (r & 0x3) | 0x8 : r];
+      }
+    }
+  }
+  return uuid.join('') + new Date().getTime();
+}