diff --git a/src/engineer/utils/object.ts b/src/engineer/utils/object.ts
index 3e293a7..a3c38f7 100644
--- a/src/engineer/utils/object.ts
+++ b/src/engineer/utils/object.ts
@@ -22,3 +22,53 @@ export function valueOf(obj: any, key: string) {
   }
   return find(obj, key.split('.'))
 }
+
+function nextValue(keys: string[]): any {
+  if (!keys.length) {
+    return undefined
+  }
+  if (Number.isNaN(parseInt(keys[0]))) {
+    return {}
+  }
+  return []
+}
+
+function set(obj: any, keys: string[], value: any): boolean {
+  if (!keys.length) {
+    return false
+  }
+  if (obj == null || typeof obj !== 'object') {
+    return false
+  }
+  const key = keys.shift()!
+  if (!Array.isArray(obj)) {
+    if (!keys.length) {
+      obj[key] = value
+      return true
+    }
+    if (obj[key] == null) {
+      obj[key] = {} // 初始化
+    }
+    return set(obj[key], keys, value)
+  }
+  const index = Number.parseInt(key)
+  if (Number.isNaN(index)) {
+    return false
+  }
+  if (!keys.length) {
+    obj.splice(index, 1, value)
+    return true
+  }
+  for (let i = obj.length; i <= index; i++) {
+    if (i < index) {
+      // obj.push(undefined)
+      // } else {
+      obj.push(nextValue(keys))
+    }
+  }
+  return set(obj[index], keys, value)
+}
+
+export function setValue(obj: any, key: string, value: any): boolean {
+  return set(obj, key.split('.'), value)
+}