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my_blog's Issues

请教网站如何搭建的

您好,请教一下这个博客网站是如何搭建的呀,能否分享一下思路吗?非常感谢!

JS-深入数组 011: 快排的实现有问题,输入[1, 2, 3, 4...],返回[2, 3, 3, 4...]

看着代码就发现不对劲,然后又贴了测试用例,就怀疑自己没看懂,然而经过测试,确实是代码实现有问题哦:

const quickSort = (a, from, to) => {
    //哨兵位置
    let thirdIndex = 0;
    while (true) {
        //...
        let tmpArr = _sort(a[from], a[thirdIndex], a[to - 1]);
        a[from] = tmpArr[0]; a[thirdIndex] = tmpArr[1]; a[to - 1] = tmpArr[2];
        // 现在正式把 thirdIndex 作为哨兵
        let pivot = a[thirdIndex];
        [a[from], a[thirdIndex]] = [a[thirdIndex], a[from]];
        // 正式进入快排
        let lowEnd = from + 1;
        let highStart = to - 1;
        a[thirdIndex] = a[lowEnd];
        a[lowEnd] = pivot;
        //...
    }
}

上面的 [a[from], a[thirdIndex]] = [a[thirdIndex], a[from]];先是交换了item,

然后下面a[thirdIndex] = a[lowEnd],即覆盖掉了a[thirdIndex] = a[from]

造成一个item丢失和重复了一个item

var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
sort(arr, (a, b) => a - b);
console.log(arr); // [2, 3, 3, 4, 5, 6, 7, 8, 9, 10, 11]

050: Promise 之问(五)——实现Promise的 all 和 race

这段代码有误:

Promise.all = function(promises) {
  return new Promise((resolve, reject) => {
    let result = [];
    let len = promises.length;
    if(len === 0) {
      resolve(result);
      return;
    }
    const handleData = (data, index) => {
      result[index] = data;
      // 最后一个 promise 执行完
      if(index == len - 1) resolve(result);
    }
    for(let i = 0; i < len; i++) {
      // 为什么不直接 promise[i].then, 因为promise[i]可能不是一个promise
      Promise.resolve(promise[i]).then(data => {
        handleData(data, i);
      }).catch(err => {
        reject(err);
      })
    }
  })
}

Promise.then显然是异步的,所以handleData判断时不能使用index == len - 1作为收集完的判断:

    const handleData = (data, index) => {
      result[index] = data;
      // 最后一个 promise 执行完
      if(index == len - 1) resolve(result);
    }

应该是:

let count = 0;
    const handleData = (data, index) => {
      result[index] = data;
      // 最后一个 promise 执行完
      if(++count == len) resolve(result);
    }

CSS 006:CSS如何进行圣杯布局 新增 Grid 布局方法

<!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>
      header {
        height: 100px;
        line-height: 100px;
        text-align: center;
        color: #fff;
        background: red;
      }

      footer {
        height: 100px;
        line-height: 100px;
        text-align: center;
        color: #fff;
        background: red;
      }

      main {
        display: grid;
        height: 200px;
        line-height: 200px;
        text-align: center;
        grid-template-columns: 200px auto 200px;  // 此处可以使用 template-columns 属性对列进行划分
      }

      aside {
        background: yellow;
      }

      article {
        color: #fff;
        background: #1890ff;
      }
    </style>
  </head>

  <body>
    <header>这是头部</header>
    <main>
      <aside>左边栏</aside>
      <article>文章</article>
      <aside>右边栏</aside>
    </main>
    <footer>这是页脚</footer>
  </body>
</html>

博主

博客为啥进不去了,是ip更改了吗

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