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+# Gitee 7 周年-码力检测第三关
+![书信](https://oschina.gitee.io/gitee-7th/img/level_3.53a48ed9.png)
+
+```js
+/** 转换为平仄，映射 0、1 */
+const parseTone = (tone) => {
+  return [3, 4].includes(tone)  ? 1 : 0;
+};
+
+const decode = (data) => {
+  return data.map(bins => {
+    return parseInt(bins.join(''), 2)
+  });
+};
+
+const toChar = code => String.fromCharCode(code);
+
+/** 按声调标注（轻声发音按单字原音） */
+const tonesGroup = [
+  [2, 4, 3, 2, 2, 1, 4, 1],
+  [2, 4, 4, 4, 2, 4, 2, 4],
+  [1, 4, 4, 1, 2, 4, 4, 4],
+  [2, 4, 4, 4, 2, 1, 2, 2],
+  [1, 4, 4, 2, 4, 4, 1, 2],
+  [2, 4, 4, 1, 2, 1, 2, 3],
+  [2, 3, 3, 2, 3, 4, 3, 2],
+  [1, 4, 4, 1, 1, 4, 1, 4],
+  [2, 4, 4, 4, 1, 4, 2, 1]
+];
+
+const binary = tonesGroup.map((tones) => {
+  return tones.map(parseTone);
+});
+
+const answer = decode(binary).map(toChar).join('');
+
+// console.log( 'binary:\n', binary );
+console.log(answer);
+```
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