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code.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" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Document</title>
<style>
#container {
width: 100%;
height: 200px;
line-height: 200px;
text-align: center;
color: #fff;
background-color: #444;
font-size: 30px;
}
.box {
position: absolute;
left: 0;
top: 0;
width: 100px;
height: 100px;
border: 1px solid;
}
.box1 {
border: 1px solid red;
/* transform: translate(50px, 50px) rotate(45deg); */
transform: translate(50px, 50px);
/* transform: rotate(45deg); */
}
.box2 {
border: 1px solid blue;
transform: rotate(45deg) translate(50px);
}
</style>
</head>
<body>
<div id="container"></div>
<div class="box1 box"></div>
<div class="box2 box"></div>
<script>
function f(matrix) {
const res = [];
const len = matrix.length;
function dfs(path, curIndex) {
if (path.length === len) {
res.push(path.slice().join(""));
return;
}
for (let i = 0; i < matrix[curIndex].length; i++) {
path.push(matrix[curIndex][i]);
dfs(path, curIndex + 1);
path.pop();
}
}
dfs([], 0);
return res;
}
console.log(
f([
["a", "b"],
["n", "m"],
["0", "1"],
])
);
// JS 实现一个带并发限制的异度调度器 Scheduler，保证同时运行的任务最多有两个。完善下面代码中的 Scheduler 类，使得以下程序能正确输出。
class Scheduler {
constructor() {
this.waitTasks = []; // 待执行的任务队列
this.excutingTasks = []; // 正在执行的任务队列
this.maxExcutingNum = 2; // 允许同时运行的任务数量
}
add(promiseMaker) {
if (this.excutingTasks.length < this.maxExcutingNum) {
this.run(promiseMaker);
} else {
this.waitTasks.push(promiseMaker);
}
}
run(promiseMaker) {
const len = this.excutingTasks.push(promiseMaker);
const index = len - 1;
promiseMaker().then(() => {
this.excutingTasks.splice(index, 1);
if (this.waitTasks.length > 0) {
this.run(this.waitTasks.shift());
}
});
}
}
const timeout = (time) =>
new Promise((resolve) => {
setTimeout(resolve, time);
});
const scheduler = new Scheduler();
const addTask = (time, order) => {
scheduler.add(() => timeout(time).then(() => console.log(order)));
};
addTask(1000, "1");
addTask(500, "2");
addTask(300, "3");
addTask(400, "4");
// output：2 3 1 4
// 一开始，1，2两个任务进入队列。
// 500ms 时，2完成，输出2，任务3入队。
// 800ms 时，3完成，输出3，任务4入队。
// 1000ms 时，1完成，输出1。
</script>
</body>
</html>