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在模擬器中，使用ASIHTTPRequest的setCompletionBlock：消息總是會導致EXC_BAD_ACCESS錯誤。即使將NSZombieEnabled設置爲YES也不能說明情況。setCompletionBlock：僅在模擬器中導致EXC_BAD_ACCESS ..在設備上正常工作
__weak ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
[request setCompletionBlock:^{
int statusCode = [request responseStatusCode];
NSLog(@"%d",statusCode);
}];
[request setFailedBlock:^{
// send statuscode error back
int statusCode = [request responseStatusCode];
NSLog(@"%d",statusCode);
}];
[request startAsynchronous];