算法七月算法打卡

Posted 2023-02-23 усил

# 2022-07-11

深拷贝

const copyObject = (obj = ) => 
  let newObj = null
  if (typeof (obj) === 'object' && obj !== null) 
    newObj = obj instanceof Array ? [] : 
    // 进入下一层进行递归
    for (let i in obj) newObj[i] = copyObject(obj[i])
   else 
    newObj = obj
  
  return newObj


// 测试
let obj = 
  id: 1,
  func: () => 
    console.log('func')
  ,
  userInfo: 
    name: '浩浩',
    age: 23,
    birthday: '1999-05-29'
  ,
  hobby: ['敲代码', '还是敲代码']


const newObj = copyObject(obj)

obj.userInfo.name = 'haohao'
obj.hobby[0] = '躺平'

console.log('旧值', obj);
console.log('新值', newObj)

---

# 2022-07-12

数组去重

let arr = [undefined, 2, null, 3, 4, undefined, null, 2, 7, 1, 2, 4, 5]

// 方法一
let a = []
arr.forEach(item => 
  if (!a.includes(item)) a.push(item)
)
console.log("方法一：", a)

// 方法二
let b = Array.from(new Set(arr))
console.log("方法二：", b)

---

# 2022-07-13

数组扁平化

function flatter(arr) 
  if (!arr.length) return;
  
  return arr.reduce((pre, cur) => 
    return Array.isArray(cur) ? [...pre, ...flatter(cur)] : [...pre, cur]
  , []);


// 测试
let arr = [1, 2, [1, [2, 3, [4, 5, [6]]]]]
console.log(flatter(arr));

---

# 2022-07-14

延迟模拟定时

setTimeout (function () 
  eventFunc();
  setTimeout(arguments.callee, 500);
, 500)

function eventFunc () 
  console.log("每隔0.5秒执行一次");

---

# 2022-07-15

基于 XMLHttpRequest 封装 Ajax

let XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest;
function ajax(option) 
    // 请求 url
    let url = option.url;
    // 请求类型
    let type = option.type;
    // 请求参数
    let data = option.data;
    // 是否异步
    let async = option.async === false ? true : option.async;

    // 请求参数处理
    let reqParam = "";
    if (typeof data === "object") 
        for (let key in data) 
            reqParam += `key=$data[key]&`
        
        reqParam.slice(0, reqParam.length - 1);
    

    // 获取 XMLHttpRequest 实例对象
    let xhr = new XMLHttpRequest();

    let flag = false;
    // 监听状态变化
    xhr.onreadystatechange = () => 
        
        // 请求前
        if (xhr.readyState <= 1) 
            
            if (option.beforeSend && !flag) 
                option.beforeSend();
                flag = true;
            
        

        // 请求完成
        if (xhr.readyState === 4) 
            let res;
            if (option.complete) option.complete();

            // 响应完成
            if (xhr.status === 200) 

                // 判断响应数据类型
                let resType = xhr.getResponseHeader("content-Type");

                // 响应数据处理
                if (resType.indexOf("json") > -1) 
                    res = JSON.parse(xhr.responseText);
                 else if (resType.indexOf("xml") > -1) 
                    res = xhr.responseXML;
                 else 
                    res = xhr.responseText;
                

                if (option.success) option.success(res);
             else 
                if (option.error) option.error(xhr)
            
         
    

    // get 请求
    if (type === "get" || type === "GET") 
        let fullUrl = reqParam.length == 0 ? url : `$url?$reqParam`;
        // 发起请求
        xhr.open(type, fullUrl, async);
        // 发送请求
        xhr.send(null);
    

    // post 请求
    if (type === "post" || type === "POST") 
        // 发起请求
        xhr.open(type, url, async);
        // 设置请求头
        xhr.setRequestHeader("content-Type", "application/x-www-form-urlencoded");
        // 发送请求
        xhr.send(reqParam);
    


// post
ajax(
    url: "http://39.104.61.32/api/user/register",
    type: "post",
    async: true,
    data: 
        userName: "aaa1231",
        password: "321",
        gender: 2
    ,
    beforeSend: function () 
        console.log("api/user/register 请求前");
    ,
    success: function (res) 
        console.log("api/user/register 请求成功", res);
    ,
    error: function (error) 
        console.log("api/user/register 请求发生错误", error);
    ,
    complete: function () 
        console.log("api/user/register 请求完成");
    
)
// get
ajax(
    url: "http://39.104.61.32/api/atMe/number",
    type: "get",
    async: true,
    beforeSend: function () 
        console.log("api/atMe/number 请求前");
    ,
    success: function (res) 
        console.log("api/atMe/number 请求成功", res);
    ,
    error: function (error) 
        console.log("api/atMe/number 请求发生错误", error);
    ,
    complete: function () 
        console.log("api/atMe/number 请求完成");
    
)

基于 promise 封装 Ajax

let XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest;
function http(option) 
    let url = option.url;
    let data = option.url;
    let type = option.type;

    let reqParams = "";
    if (typeof data == "object") 
        for (let key in data) 
            reqParams += `&$key=$data[key]`
        
        reqParams = reqParams.slice(0, str.length - 1);
    

    return new Promise((resolve, reject) => 
        let xhr = new XMLHttpRequest();
        xhr.onreadystatechange = () => 
            if (xhr.readyState == 4) 
                if (xhr.status == 200) 
                    let res;
                    let resType = xhr.getResponseHeader("content-Type");
                    if (resType.indexOf("jsonp") >= -1) 
                        res = JSON.parse(xhr.responseText);
                     else if (resType.indexOf("xml") >= -1) 
                        res = xhr.responseXML;
                     else 
                        res = xhr.responseText;
                    
                    resolve(res);
                 else 
                    reject(xhr)
                
            
        

        if (type == "get" || type == "GET") 
            let fullUrl = reqParams.length == 0 ? url : `$url?$reqParams`;
            xhr.open(type, fullUrl, true);
            xhr.send(null);
        

        if (type == "post" || type == "POST") 
            xhr.open(type, url, true);
            xhr.setRequestHeader("content-Type", "application/x-www-form-urlencoded");
            xhr.send(reqParams)
        
    )


// get
http(
    url: "http://39.104.61.32/api/atMe/number",
    type: "get"
).then(res => 
    console.log("api/atMe/number", res)
).catch(error => 
    console.log(error);
) 

// post
http(
    url: "http://39.104.61.32/api/blog/create",
    type: "post",
    data: 
        content: "@fwz123123 - fwz123123 123"
    
).then(res => 
    console.log("app/user/login", res);
).catch(error => 
    console.log(error);
)

---

# 2022-07-16

订阅事件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>$on 和 $emit</title>
</head>
<body>
    <div class="wrapper">
        <div class="container">
            <h3>订阅者</h3>
            <div class="content">
                <div class="a"></div>
                <div class="b"></div>
                <div class="c"></div>
            </div>
            <div class="btn-group publish">
                <button class="btn" data-index="A">订阅事件A</button>
                <button class="btn" data-index="B">订阅事件B</button>
                <button class="btn" data-index="C">订阅事件C</button>
            </div>
            <div class="btn-group cancel-publish">
                <button class="btn" data-index="A">取消事件A</button>
                <button class="btn" data-index="B">取消事件B</button>
                <button class="btn快速排序算法--两个小人扔萝卜

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