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Web程序设计单选题中等

AJAX请求完成后,用于处理响应数据的回调函数是?

0{ "key": "A", "text": "onload" }
1{ "key": "B", "text": "onreadystatechange" }
2{ "key": "C", "text": "readystatechange" }
3{ "key": "D", "text": "onstatechange" }