文章/答案/技术大牛

发布

社区首页 >专栏 >JSON基础、原生的ajax及JQuery.ajax

JSON基础、原生的ajax及JQuery.ajax

原创

申小兮

发布于 2023-04-19 13:21:33

92920

代码可运行

文章被收录于专栏：前端开发基础前端开发基础

运行总次数：0

代码可运行

一、JSON

1、什么是JSON

一种轻量级的数据交换格式，主要用于跟服务器进行交换数据

（1）从服务器上读取JSON数据，将json数据转化成js对象，然后在网页中使用数据

（2）json数据结构：对象+数组

<body>
<script>
    var json = {
        data:{
            students:[
                {
                    name:'tom',
                    age:18,
                    skill:['sing','run']
                },
                {
                    name:'bob',
                    age:19,
                    skill:['study','swim']
                }
            ]
        }
    }
    //获取数组内容，可以用for遍历或each
    console.log($.each(json.data.students,function(index,item){
        console.log(index,item);
        console.log(item.name);
    }));
</script>
</body>

2、JSON.stringify()

json对象转成字符串

3、JSON.parse()

字符串【注意需要是标准的json字符串格式转成json】

<script>
    var json = {
        data:{
            students:[
                {
                    name:'tom',
                    age:18,
                    skill:['sing','run']
                },
                {
                    name:'bob',
                    age:19,
                    skill:['study','swim']
                }
            ]
        }
    }
    var str = JSON.stringify(json)
    console.log(str);
    var obj = JSON.parse(str)
    console.log(obj);
</script>

二、AJAX（用户登录 - 天行数据TianAPI）

1、open(method,url,async)

method：请求类型（GET、POST）

url：接口地址

async:true（异步）、false（同步）

【接口基本上都是异步（可以同时进行）的】

2、请求类型：get和post

（1）相同：都可以跟服务器进行数据交互

（2）不同：

①传送方式：get是通过地址栏进行传输，post是通过报文传输

②传送长度：get的长度会被限制，post不限长度

③安全性：get安全性低，参数会暴露在地址栏，一般用于获取，post安全性高，一般可以传输数据

3、send(string)

发送请求【post情况下string写参数的地方】

4、参数传递

（1）get：在地址栏上，url后面拼接?key=value&key=value

（2）post：send(key=value)

5、响应

responseText属性：获取以字符串形式返回的数据

（1）Jscript的get写法：（天行的舔狗日记为例）

<script>
    //创建
    var xhr = new XMLHttpRequest()
    xhr.open(
        'GET',
        'http://api.tianapi.com/tiangou/index?key=a3828b7efb833ce8c26d05f10ed40e04',
        true
    )
    //发送
    xhr.send()
    //响应
    xhr.onload = function(){
        console.log(xhr.responseText);
        var data = JSON.parse(xhr.responseText)
        console.log(data);
    }
</script>

（2）Jscript的post写法：

<script>
    var xhr = new XMLHttpRequest();
      xhr.open(
        "POST",
        "http://120.78.172.212:7789/students/sys/loginWeb",
        true
      );
      // 配置Content-Type： application/x-www-form-urlencoded
      xhr.setRequestHeader(
        "Content-Type",
        "application/x-www-form-urlencoded",
        "charset=UTF-8"
      );
      // 发送
      xhr.send("username=lyx&password=888888");
      // 响应
      xhr.onload = function () {
        console.log(xhr.responseText);
        var data = JSON.parse(xhr.responseText);
        console.log(data);
      };
</script>

（3）JQ的get写法：

<script>
    $.ajax({
        async:true,
        type:'GET',
        url:'http://api.tianapi.com/tianqi/index?key=408065bffbb866c9782f501d3ff046bf&city=福州市',
        success:function(res){
            console.log(res);
        }
    })
</script>

（4）JQ的post写法：

<script>
    $.ajax({
        async:true,
        type:'POST',
        data:{
            key:'a3828b7efb833ce8c26d05f10ed40e04'
        },
        url:'http://api.tianapi.com/tiangou/index',
        success:function(res){
            console.log(res);
        }
    })
</script>

三、回顾JS、JQ，代码例子

1、简单的添加、删除、编辑表格（具体效果，小伙伴可以复制代码自己操作一下哦🧐）

<!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>Document</title>
    <script src="../jquery-3.6.0.js"></script>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
 
        input {
            width: 400px;
            height: 30px;
            padding-left: 10px;
            outline: none;
        }
 
        .all {
            margin-top: 10px;
            text-align: center;
            margin-bottom: 30px;
        }
 
        table {
            margin: auto;
        }
 
        th {
            width: 300px;
            height: 20px;
            border: 2px solid rgba(134, 131, 131, 0.216);
            box-sizing: border-box;
            background-color: skyblue;
            color: #fff;
        }
 
        .btn1 {
            padding: 5px 10px;
            box-sizing: border-box;
            background-color: skyblue;
            color: #fff;
            border: 1px solid skyblue;
            border-radius: 3px;
        }
 
        td {
            text-align: center;
            height: 30px;
            border: 2px solid rgba(134, 131, 131, 0.216);
            box-sizing: border-box;
        }
 
        .btn2 {
            padding: 2px 4px;
            box-sizing: border-box;
        }
 
        .btn3 {
            padding: 2px 4px;
            box-sizing: border-box;
        }
    </style>
</head>
 
<body>
    <!-- <form action=""> -->
        <div class="all">
        <span style="font-weight: bold;">姓名：</span>
        <input type="text" id="user" placeholder="请输入姓名">
        <span style="font-weight: bold;">年龄：</span>
        <input type="text" id="age" placeholder="请输入年龄">
        <button class="btn1">添加</button>
        </div>
    <!-- </form> -->
    <div class="main">
        <table border="1" cellspacing="0">
            <tr>
                <th>ID</th>
                <th>姓名</th>
                <th>年龄</th>
                <th>操作</th>
            </tr>
            <!-- <tr>
                <td>1</td>
                <td>张三</td>
                <td>18</td>
                <td>
                    <button class="btn2">编辑</button>
                    <button class="btn3">删除</button>
                </td>
            </tr> -->
        </table>
    </div>
    <script>
        var table = document.querySelector('table')
 
        var arr = [
            {
                name: '张三',
                age: 17
            },
            {
                name: '李四',
                age: 20
            },
            {
                name: '王五',
                age: 23
            }
        ]
 
        //添加
        var add = document.querySelector('.btn1')
        add.onclick = function(){
            var userName = document.querySelector('#user')
            var userAge = document.querySelector('#age')
            //去掉首尾空格trim()
            if(userName.value.trim().length != 0 & isNaN(parseInt(userAge.value.trim()))==false){
                var newObj = 
                {
                    name : userName.value,
                    age : userAge.value
                }
            arr.push(newObj)
            userName.value = ''
            userAge.value = ''
            console.log(arr);
            create()
            }else{
                alert('添加失败，请输入正确的名字和年龄')
            }
            
        }
 
        //创建
        function create() {
            //清除
            table.innerHTML = ''
            //创建表头
            var trTh = document.createElement('tr')
            trTh.innerHTML = `
                <th>ID</th>
                <th>姓名</th>
                <th>年龄</th>
                <th>操作</th>
                `
            table.appendChild(trTh)
 
            //创建节点
            for (var i = 0; i < arr.length; i++) {
                // console.log(arr[i]);
                var newTr = document.createElement('tr');
                console.log(newTr);
                newTr.innerHTML = `
                <td>${i+1}</td>
                <td>${arr[i].name}</td>
                <td>${arr[i].age}</td>
                <td>
                    <button class="btn2">编辑</button>
                    <button class="btn3">删除</button>
                </td>
            `
            table.appendChild(newTr);
 
            //编辑
            var editArr = document.querySelectorAll('.btn2')
            for(var j = 0;j<editArr.length;j++){
                (function(j){
                    editArr[j].onclick = function(){
                        // console.log(j);
                        //修改
                        var editName = prompt('请输入姓名')
                        if(editName.trim().length != 0){
                            // console.log(editName.length);
                            arr[j].name = editName              
                        }else{
                            alert('请输入正确的姓名')
                        }
 
                        var editAge = parseInt(prompt('请输入年龄'))
                        if(isNaN(editAge)==false){
                            arr[j].age = editAge             
                        }else{
                            alert('请输入正确的年龄')
                        }
 
                        // console.log(arr);
                        create()
                    }
                })(j)
            }
 
            //删除
            var delArr = document.querySelectorAll('.btn3')
            for(z = 0;z<delArr.length;z++){
                (function(z){
                    delArr[z].onclick = function(){
                        // console.log(z);
                        arr.splice(z,1)
                        // console.log(arr);
                        create()
                    }
                })(z)
            }
        }
    }
        create()
 
    </script>
</body>
</html>

2、实现简单界面的转换（具体效果，小伙伴可以复制代码自己操作一下哦🧐）

<!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>Document</title>
    <script src="../jquery-3.6.0.js"></script>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .box{
            height: 50px;
            background-color: #ccc;
            text-align: center;
            line-height: 50px;
        }
        ul{
            display: flex;
            justify-content: center;
        }
        li{
            width: 200px;
            height: 50px;
            list-style: none;
            color: #fff;
        }
        .active{
            background-color: red;
        }
    </style>
</head>
<body>
    <div class="box">
        <ul>
            <li>商品介绍</li>
            <li>规格与包装</li>
            <li>售后保障</li>
            <li>商品评价</li>
            <li>本店好评商品</li>
        </ul>
    </div>
    <div class="main">
        <div>商品介绍</div>
        <div>规格与包装</div>
        <div>售后保障</div>
        <div>商品评价</div>
        <div>本店好评商品</div>
    </div>
    <script>
        $('li').eq(0).addClass('active')
        $('.main div').eq(0).show().siblings().hide()
 
        $('li').click(function(){
            $(this).addClass('active').siblings().removeClass('active')
            $('.main div').eq($(this).index()).show().siblings().hide()
        })
    </script>
</body>
</html>

3、实现无限左拉或右拉（具体效果，小伙伴可以复制代码自己操作一下哦🧐）

<!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>Document</title>
    <script src="../jquery-3.6.0.js"></script>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        .all {
            margin: auto;
            width: 687px;
            height: 186px;
            border: 1px solid #d3d3d3;
            position: relative;
            top: 20px;
            background-color: #f5f5f5;
        }
        .banner{
            width: 645px;
            height: 186px;
            position: absolute;
            left: 21px;
            overflow-x: hidden;
            /* background-color: #f5f5f5; */
        }
        .move {
            width: 2580px;
            height: 186px;
            position: absolute;
            left: 0;
            /* background-color: red; */
            /* transition: 500ms; */
        }
        .left {
            position: absolute;
            top: 71px;
            width: 17px;
            height: 17px;
            left: 4px;
            cursor: pointer;
            background-position: -260px -75px;
            background-image: url('https://s2.music.126.net/style/web2/img/index/index.png?d8ca63df648aafce67216aba5d1c2588');
        }
        .left:hover{
            background-position: -280px -75px;
        }
        .right {
            position: absolute;
            top: 71px;
            width: 17px;
            cursor: pointer;
            height: 17px;
            right: 4px;
            background-position: -300px -75px;
            background-image: url('https://s2.music.126.net/style/web2/img/index/index.png?d8ca63df648aafce67216aba5d1c2588');
        }
        .right:hover{
            background-position: -320px -75px;
        }
        ul{
            position: absolute;
            /* left: 0; */
            /* background-color: blue; */
            margin-top: 28px;
            width: 645px;
            transition: 500ms;
            display: flex;
            justify-content: space-between;
        }
        li{
            width: 118px;
            height: 150px;
            list-style: none;
            /* margin-left: 11px; */
        }
        .img{
            margin-bottom: 7px;
            display: flex;
        }
        .img img{
            width: 100px;
            height: 100px;
            display: block;
        }
        .background{
            width: 118px;
            height: 100px;
            background-image: url('https://s2.music.126.net/style/web2/img/coverall.png?07ddd97c068cca474df796099520491e');
            background-position: 0 -570px;
            position: absolute;
            /* top: 0; */
            /* left: 0; */
        }
        .text{
            white-space: nowrap;
            width: 90%;
            font-size: 13px;
            overflow: hidden;
            text-overflow: ellipsis;
        }
    </style>
</head>
 
<body>
    <div class="all">
        <div class="left"></div>
        <div class="right"></div>
        <div class="banner">
            <div class="move">
                <ul class="ul1" style="left: -645px;">
                    <li>
                        <div class="img">
                            <img src="https://p4.music.126.net/11QDr3X3ZsJmyBHG_UM0-A==/109951167692927327.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                    <li>
                        <div class="img">
                            <img src="https://p3.music.126.net/z-8Yi3OrLXpDFWP4YNQhNQ==/109951167596578985.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                    <li>
                        <div class="img">
                            <img src="https://p3.music.126.net/XG8DFES67eGr-l4xcmu2Yg==/109951167695926471.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                    <li>
                        <div class="img">
                            <img src="https://p4.music.126.net/c_2UDiBs-3CmnaqYXLJi-A==/109951167677420073.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                    <li>
                        <div class="img">
                            <img src="https://p4.music.126.net/H2eXxMzVtAGlKYOgDxD-wQ==/109951167655105219.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                </ul>
                <ul class="ul2" style="left: 0;">
                    <li>
                        <div class="img">
                            <img src="https://p4.music.126.net/CrVEXgg6EK_8xTJNxobsJA==/109951167674088453.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                    <li>
                        <div class="img">
                            <img src="https://p4.music.126.net/Z2qKcAdS0eAYrJuJMwa3VA==/109951167611690026.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                    <li>
                        <div class="img">
                            <img src="https://p3.music.126.net/mBWkuKXTHjme6pV26GNd4w==/109951167604112526.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                    <li>
                        <div class="img">
                            <img src="https://p4.music.126.net/tMylvOQj12OZDW46EeZt5w==/109951167607647677.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                    <li>
                        <div class="img">
                            <img src="https://p3.music.126.net/LkwTIyU7Zo853W6LUfYpag==/109951167574776183.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                </ul>
                <ul class="ul3" style="left: 645px;">
                    <li>
                        <div class="img">
                            <img src="https://p4.music.126.net/11QDr3X3ZsJmyBHG_UM0-A==/109951167692927327.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                    <li>
                        <div class="img">
                            <img src="https://p3.music.126.net/z-8Yi3OrLXpDFWP4YNQhNQ==/109951167596578985.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                    <li>
                        <div class="img">
                            <img src="https://p3.music.126.net/XG8DFES67eGr-l4xcmu2Yg==/109951167695926471.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                    <li>
                        <div class="img">
                            <img src="https://p4.music.126.net/c_2UDiBs-3CmnaqYXLJi-A==/109951167677420073.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                    <li>
                        <div class="img">
                            <img src="https://p4.music.126.net/H2eXxMzVtAGlKYOgDxD-wQ==/109951167655105219.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                </ul>
                <ul class="ul4" style="left: 1290px;">
                    <li>
                        <div class="img">
                            <img src="https://p4.music.126.net/CrVEXgg6EK_8xTJNxobsJA==/109951167674088453.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                    <li>
                        <div class="img">
                            <img src="https://p3.music.126.net/Z2qKcAdS0eAYrJuJMwa3VA==/109951167611690026.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                    <li>
                        <div class="img">
                            <img src="https://p3.music.126.net/mBWkuKXTHjme6pV26GNd4w==/109951167604112526.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                    <li>
                        <div class="img">
                            <img src="https://p4.music.126.net/tMylvOQj12OZDW46EeZt5w==/109951167607647677.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                    <li>
                        <div class="img">
                            <img src="https://p3.music.126.net/LkwTIyU7Zo853W6LUfYpag==/109951167574776183.jpg?param=100y100" alt="">
                            <div class="background"></div>
                        </div>
                        <div class="text" style="color: #000;">Humble Swag GT Mixtape</div>
                        <div class="text" style="color: #666;">马思唯 / A Few Good Kids Records</div>
                    </li>
                </ul>
            </div>
        </div>
    </div>
 
    <script>
        $('.right').click(function(){
            console.log($('.ul2').css('left'));
            if($('.move').css('left')=='0px'){
                $('.move').animate({left:'-645px'},1000,'linear',function(){})
            }else{
                $('.move').animate({left:'-1290px'},1000,'linear',function(){
                    $('.move').css('left','0px')
                })
            }
                
        })
        $('.left').click(function(){
            if($('.move').css('left')=='-645px'){
                $('.move').animate({left:'0px'},1000,'linear',function(){})
            }else{
                $('.move').animate({left:'645px'},1000,'linear',function(){
                    $('.move').css('left','-645px')
                })
            }
                
        })
    </script>
</body>
</html>

原创声明：本文系作者授权腾讯云开发者社区发表，未经许可，不得转载。

如有侵权，请联系 cloudcommunity@tencent.com 删除。

前端

json

ajax

jquery

原创声明：本文系作者授权腾讯云开发者社区发表，未经许可，不得转载。

如有侵权，请联系 cloudcommunity@tencent.com 删除。

登录后参与评论

2 条评论

热度

最新

smiling回复腾讯技术工程官方号

2021-01-26

信鸽产品已下线，另一款推送产品——腾讯移动推送可以提供更优质的服务。「腾讯云移动推送 TPNS」相比「信鸽产品」的主要区别：1、信鸽推送共享30万条/秒，TPNS推送独享高速通道30万条/秒，更快，更稳定2、信鸽仅支持华为、小米、魅族、FCM厂商通道，TPNS支持华为、小米、魅族、OPPO、vivo、FCM、ROG，覆盖更多机型，更高抵达率3、信鸽共享存储空间，TPNS支持App级数据隔离，且符合GDPR规范，可支持出海业务，更安全4、TPNS更有多样化推送能力（如定时、定速、循环推送；按设备、账号、标签推送；用户分群、A/B test等），精准推送，有效提升推送效果，进入腾讯移动推送 TPNS 产品文档查看更多操作指引 https://cloud.tencent.com/document/product/548/37240?from=13828

回复回复点赞举报

Shawn_Kid回复腾讯技术工程官方号

2018-02-26

回复回复点赞举报

编辑精选文章

换一批

万字详解高可用架构设计

1452

Go 开发者必备：Protocol Buffers 入门指南

704

10分钟带你彻底搞懂分布式链路跟踪

378