实现异步事件A-B-C依次执行
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| const A = () => {
console.log('A');
};
const B = () => {
console.log('B');
};
const C = () => {
console.log('C');
};
const myPromise = (callback, delay) => {
return new Promise((resolve, reject) => {
setTimeout(() => {
callback();
resolve();
}, delay);
});
};
const loop = () => myPromise(A, 3000).then(() => myPromise(B, 2000)).then(() => myPromise(C, 1000)).then(loop);
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请你实现异步接口C，它的参数基于异步接口A的user_name以及异步接口B的mobile
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| Promise.all([
fetch('A').then(res => res.json())
fetch('B').then(res => res.json())
]).then((res) => {
fetch(`C?user_name=${res[0].user_name}&mobile=${res[1].mobile}`).then(res => res.json());
});
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实现一个探测 CPU 占比的方法
根据 setInterval 的时间间隔，根据最后输出的时间比 1000ms 多多少，越多代表 CPU 占比越高。
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| let start = Date.now();
const cpuTimer = setInterval(() => {
const cb = () => {
const end = Date.now();
const time = end - start;
start = end;
console.log(`CPU 占比：${time}ms`);
};
cb();
}, 1000);
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