@@ -3,7 +3,12 @@
3−  useEffect(() => {
4−    fetch(`/api/users/${id}`).then(r => r.json()).then(setUser)
5−  }, [])
3+  useEffect(() => {
4+    const ctrl = new AbortController()
5+    fetch(`/api/users/${id}`, { signal: ctrl.signal })
6+      .then(r => { if (!r.ok) throw new Error(r.status); return r.json() })
7+      .then(setUser)
8+    return () => ctrl.abort()
9+  }, [id])

const user = { id: 1, name: "Ada" }
 
// 查询并问候
function greet(u) {
  return `Hi ${u.name}`
}
 
export default greet

def greet(name: str) -> str:
    # 问候语
    return f"Hi {name}"
 
if __name__ == "__main__":
    print(greet("Ada"))