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app/middleware/utils/getString.js

@@ -0,0 +1,10 @@
+// 截取数组元素，拼接成字符串并返回
+module.exports = (arr, start, end) => {
+    let newString = '';
+    arr.forEach((element, index) => {
+        if (index >= start && index <= end) {
+            newString = newString + element;
+        }
+    });
+    return newString;
+};