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chain.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>
<script>
/**
编程题：实现一个chain, eat函数打印eat，work函数打印work，sleep函数休息
chain().eat().sleep(5).work().eat().work().sleep(10)
* **/
function chain() {
const list = [];
setTimeout(async () => {
for (let i = 0; i < list.length; i++) {
if (list[i].type === "sleep") {
await list[i].fn();
} else {
list[i].fn();
}
}
}, 0)
const obj = {
eat() {
list.push({
type: "eat",
fn() {
console.log("eat");
}
})
return obj;
},
work() {
list.push({
type: "work",
fn() {
console.log("work");
}
})
return obj
},
sleep(time) {
list.push({
type: "sleep",
fn() {
return new Promise((resolve) => {
setTimeout(() => resolve(), time * 1000)
})
}
})
return obj
}
}
return obj;
}
chain().eat().sleep(1).work().eat().work().sleep(2).work();
</script>
<style>
.p{
width: 500px;
height: 500px;
border: 1px solid rebeccapurple;
}
.d1{
width: 200px;
height: 200px;
background-color: aquamarine;
float: left;
}
.d2{
width: 200px;
height: 200px;
background-color: red;
float: right;
}
</style>
</head>
<body>
<div class="p">
<div class="d1"></div>
<div class="d2"></div>
</div>
</body>
</html>