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FROM:https://stackoverflow.com/questions/824234/what-is-a-callback-function Opaque Definition A callback function is a function you provide to another 阅读全文
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同步方法和异步方法的区别 https://blog.csdn.net/kingson_wu/article/details/84442749?utm_medium=distribute.pc_relevant.none-task-blog-baidujs-2 同步方法调用在程序继续执行之前需要等待同 阅读全文