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[ajax] 2.同步和异步的区别? #63

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qiilee opened this issue Sep 29, 2019 · 0 comments

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qiilee commented Sep 29, 2019

答案：同步：阻塞的；异步：非阻塞的。

解析：

同步：阻塞的

张三叫李四去吃饭，李四一直忙得不停，张三一直等着，直到李四忙完两个人一块去吃饭
浏览器向服务器请求数据，服务器比较忙，浏览器一直等着（页面白屏），直到服务器返回数据，浏览器才能显示页面

异步：非阻塞的

张三叫李四去吃饭，李四在忙，张三说了一声然后自己就去吃饭了，李四忙完后自己去吃
浏览器向服务器请求数据，服务器比较忙，浏览器可以自如的干原来的事情（显示页面），服务器返回数据的时候通知浏览器一声，浏览器把返回的数据再渲染到页面，局部更新

qiilee added the Ajax label

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