javascript的单线程

function sleep(milliSeconds) { var startTime = new Date().getTime(); while (new Date().getTime() < startTime + milliSeconds); } setTimeout(function(){console.log("settimeout 5s called.");},5000); console.log("start sleep 10s."); sleep(10000); console.log("sleep 10s over.");

 

用nodejs运行结果：

\nodejs>node sleep.js
start sleep 10s.
sleep 10s over.
settimeout 5s called.

最后2条输出时没有停顿。