Added language data

mock-api/dafa-web/scripts/utils/choose-random.util.js

@@ -0,0 +1,14 @@
+function chooseRandom(arr, num = 1) {
+  const res = [];
+  for (let i = 0; i < num; ) {
+    const random = Math.floor(Math.random() * arr.length);
+    if (res.indexOf(arr[random]) !== -1) {
+      continue;
+    }
+    res.push(arr[random]);
+    i++;
+  }
+  return res;
+}
+
+export default chooseRandom;