diff --git a/src/js/humpToUnderline.ts b/src/js/humpToUnderline.ts
new file mode 100644
index 0000000..f1c301e
--- /dev/null
+++ b/src/js/humpToUnderline.ts
@@ -0,0 +1,14 @@
+/**
+ * 驼峰命名改为下划线命名，数字不重新起一个下划线
+ * @param str 需转换的字符串
+ * @returns 转换的结果
+ */
+export const humpToUnderline = (str: string) => {
+  let temp = str.replace(/[A-Z]/g, (match) => {
+    return `_${match.toLowerCase()}`;
+  });
+  if (temp.slice(0, 1) === "_") {
+    temp = temp.slice(1);
+  }
+  return temp;
+};