sleep函数,将程序执行挂起一段时间,阻塞程序的运行
ES6方案:
function sleep(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
async function test() {
console.log("Hello");
await sleep(1000);
console.log("World");
}
test();
ES5死循环阻塞:
function sleep(ms) {
ms += new Date().getTime();
while (new Date().getTime() < ms) {}
}
function test2() {
console.log("Hello");
sleep(1000);
console.log("World");
}
test2();
HTTP1
HTTP2
如何实现长连接?