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用async / await更方便地解决交通灯问题
source link: https://zhuanlan.zhihu.com/p/141851468
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用async / await更方便地解决交通灯问题
红灯亮一秒，然后黄灯亮两秒，然后绿灯亮三秒，重复红灯
之前用Promise实现过，见https://github.com/swordrain/traffic-light
现在发现async / await解决该问题更方便，更符合人的思维，寥寥数语而可安邦定国。
function wait(time) {
return new Promise(resolve=>{
setTimeout(resolve, time)
})
}
async function red() {
console.log('Red:' + new Date())
await wait(1000)
yellow()
}
async function yellow() {
console.log('Yellow:' + new Date())
await wait(2000)
green()
}
async function green() {
console.log('Green:' + new Date())
await wait(3000)
red()
}
red()
可见使用async / await后完全就是自然语言逻辑的翻译，毫无异步代码的烦琐。输出结果也木有问题
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