If you were building a search tool and wanted search results to pop up as you typed, write a function that gets called on every key down but calls the server when the user stops typing for 400ms.
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监听事件 -> 读前端cache ? 构建结果列表 : (发请求拿结果 -> cache并构建结果列表)
400ms 可以用计时器做 delay 处理,根据事件触发情况看是进后面流程还是 clear 掉。
用Ajax做