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traffic-light.html
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traffic-light.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
/* .container {
display: flex;
flex-direction: row;
width: 500px;
justify-content: space-between;
} */
div {
float: left;
background-color: grey;
width: 100px;
height: 100px;
border-radius: 50%;
margin-top: 26px;
margin-left: 26px;
}
.green.light {
background-color: green;
}
.yellow.light {
background-color: yellow;
}
.red.light {
background-color: red;
}
</style>
</head>
<body>
<div class="green"></div>
<div class="yellow"></div>
<div class="red"></div>
<button id="next">button</button>
</body>
<script>
function green() {
const lights = document.getElementsByTagName('div')
for (let i = 0; i < 3; i++) {
console.log(lights[i])
lights[i].classList.remove("light")
}
document.getElementsByClassName("green")[0].classList.add("light")
}
function red() {
const lights = document.getElementsByTagName('div')
for (let i = 0; i < 3; i++) {
lights[i].classList.remove("light")
}
document.getElementsByClassName("red")[0].classList.add("light")
}
function yellow() {
const lights = document.getElementsByTagName('div')
for (let i = 0; i < 3; i++) {
lights[i].classList.remove("light")
}
document.getElementsByClassName("yellow")[0].classList.add("light")
}
function sleep(t) {
return new Promise((resolve, reject) => {
setTimeout(resolve, t)
})
}
function* go() {
while(true) {
green()
yield sleep(10000)
yellow()
yield sleep(2000)
red()
yield sleep(5000)
}
}
function run(iterator) {
let {value, done} = iterator.next()
if (done)
return
if (value instanceof Promise) {
value.then(() => {
run(iterator)
})
}
}
function co(generator) {
return function() {
return run(generator())
}
}
go = co(go)
// function go() {
// green()
// setTimeout(yellow, 10000)
// setTimeout(red, 12000)
// setTimeout(go, 17000)
// }
// green()
// sleep(10000).then(() => {
// yellow()
// return sleep(2000)
// }).then(() => {
// red()
// return sleep(5000)
// })
// async function go() {
// while(true) {
// green()
// await happen(10000)
// yellow()
// await sleep(2000)
// red()
// await sleep(5000)
// }
// }
// async function go() {
// while(true) {
// green()
// await happen(document.getElementById('next'), 'click')
// yellow()
// await happen(document.getElementById('next'), 'click')
// red()
// await happen(document.getElementById('next'), 'click')
// }
// }
// function happen(event, eventName) {
// console.log('22')
// return new Promise((resolve, reject) => {
// document.addEventListener(eventName, resolve, { once: true })
// })
// }
// let count = 1
// async function setTrifficLight() {
// setInterval(() => {
// if (count < 10) {
// setTimeout(() => {
// console.log('绿灯亮')
// count++
// }, 1000)
// }
// if (count < 12 && count >= 10) {
// setTimeout(() => {
// console.log('黄灯亮')
// count++
// }, 1000)
// }
// if (count < 17 && count >= 12) {
// setTimeout(() => {
// console.log('红灯亮')
// count++
// }, 1000)
// }
// if (count === 17) {
// count = 0
// }
// }, 1000);
// }
// setTrifficLight()
</script>
</html>