Blocking is when the execution of additional JavaScript in the Node.js process must wait until a non-JavaScript operation completes. This happens because the event loop is unable to continue running JavaScript while a blocking operation is occurring.
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N
nodejs中还真没啥阻塞api, 用浏览器举例子吧
alert('') // 这是 non-JavaScript operation, 用户不点确定, 不会执行下一行代码
console.log('hello world') // 这是 additional JavaScript, 即: 未来/后面即将要执行的js
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