[iOS] NSURLConnction執行非同步呼叫
使用非同步呼叫的好處是，不需要等到函式結束返回，即可執行接下來的函式。如此從網路下載較大容量的資料，就不會讓使用者界面卡住。下載過程中的事件可請delegate處理。
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