ajax

作者: 兔子___ | 来源:发表于2018-07-23 17:18 被阅读0次

Ajax 1 - 请求纯文本

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Ajax 1 - 请求纯文本</title>
</head>
<body>
    <button id="button">请求纯文本</button>

    <br><br>

    <div id="text"></div>

    <script>
        document.getElementById('button').addEventListener("click",loadText);

        function loadText(){
            // console.log("Hello World!");
            // 创建XMLHttpRequest对象
            var xhr = new XMLHttpRequest();
            // console.log(xhr);
            // open(type,url/file,async)
            xhr.open('GET','sample.txt',true);

            // console.log("READYSTATE: ",xhr.readyState);

            // onprogress
            xhr.onprogress = function(){
                // console.log("测试READYSTATE: ",xhr.readyState);
            }


            // 两种方式请求 onload / onreadystattechange
            // xhr.onload = function(){
            //  // console.log("READYSTATE: ",xhr.readyState);
            //  // console.log(this.responseText);
            //  document.getElementById('text').innerHTML = this.responseText;
            // }

            xhr.onreadystatechange = function(){
                // console.log("READYSTATE: ",xhr.readyState);
                if (this.status == 200 && this.readyState == 4) {
                    // console.log(this.responseText);
                    document.getElementById('text').innerHTML = this.responseText;
                }else if(this.status == 404){
                    // console.log("请求的网页不存在");
                    document.getElementById('text').innerHTML = "NOT Found";
                }
            } 

            // 发送请求
            xhr.send();
        }

        // readyState 状态码
        // 0: 请求未初始化
        // 1: 服务器连接已建立
        // 2: 请求已接收
        // 3: 请求处理中
        // 4: 请求已完成，且响应已就绪

        // HTTP 状态码
        // 200 - 服务器成功返回网页
        // 404 - 请求的网页不存在
        // 503 - 服务器暂时不可用

    </script>
</body>
</html>

Ajax 2 - 请求JSON数据

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Ajax 2 - 请求JSON数据</title>
</head>
<body>
    <button id="button1">请求单个用户</button>
    <button id="button2">请求所有用户</button>

    <br><br>

    <h1>单个用户</h1>
    <div id="user"></div>

    <h1>所有用户</h1>
    <div id="users"></div>

    <script>
        document.getElementById('button1').addEventListener('click',loadUser);
        document.getElementById('button2').addEventListener('click',loadUsers);

        function loadUser(){
            var xhr = new XMLHttpRequest();
            xhr.open("GET","user.json",true);
            xhr.onload = function(){
                if (this.status == 200) {
                    // console.log(this.responseText);
                    var user = JSON.parse(this.responseText);
                    // console.log(user.name);

                    var output = '';
                    output += 
                        '<ul>'+
                            '<li>'+user.id+'</li>'+
                            '<li>'+user.name+'</li>'+
                            '<li>'+user.email+'</li>'+
                        '</ul>';
                    ;
                    document.getElementById('user').innerHTML = output;
                }
            }

            xhr.send();
        }

        function loadUsers(){
            var xhr = new XMLHttpRequest();
            xhr.open("GET","users.json",true);
            xhr.onload = function(){
                if (this.status == 200) {
                    var users = JSON.parse(this.responseText);
                    var output = '';

                    // 遍历数组
                    for(var i in users){
                        output += 
                            '<ul>'+
                                '<li>'+users[i].id+'</li>'+
                                '<li>'+users[i].name+'</li>'+
                                '<li>'+users[i].email+'</li>'+
                            '</ul>';
                        ;
                    }
                    document.getElementById('users').innerHTML = output;
                }
            }

            xhr.send();
        }

    </script>
</body>
</html>

Ajax 3 - 请求Github接口

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>3.请求Github接口</title>
    <style>
        .user{
            display: flex;
            background: #f4f4f4;
            padding: 10px;
            margin-bottom: 10px;
        }

        .user ul{
            list-style: none;
        }

    </style>
</head>
<body>
    <button id="button">请求Github接口</button>

    <br><br>

    <h1>所有Github的用户信息</h1>

    <div id="users"></div>

    <script>
        document.getElementById('button').addEventListener('click',loadUsers);

        function loadUsers(){
            var xhr = new XMLHttpRequest();
            xhr.open("GET","https://api.github.com/users",true);

            xhr.onload = function(){
                var users = JSON.parse(this.responseText);
                // console.log(users);

                var output = '';

                for(var i in users){
                    output += `
                        <div class="user">
                            <img src="${users[i].avatar_url}" width="70" height="70" />
                            <ul>
                                <li>ID: ${users[i].id}</li>
                                <li>Login: ${users[i].login}</li>
                            </ul>
                        </div>
                    `;
                }
                document.getElementById('users').innerHTML = output;

            }

            xhr.send();
        }

    </script>
</body>
</html>

Ajax 4 - 请求PHP接口

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Ajax 4 - 请求PHP接口</title>
</head>
<body>
    <button id="button">获取PHP数据</button>

    <br><br>

    <h1>正常表单GET提交数据到PHP</h1>
    <form action="process.php" method="GET">
        <input type="text" name="name">
        <input type="submit" value="提交">
    </form>

    <h1>Ajax请求数据GET</h1>
    <form id="getForm">
        <input type="text" name="name" id="name1">
        <input type="submit" value="提交">
    </form>

    <h1>正常表单POST提交数据到PHP</h1>
    <form action="process.php" method="POST">
        <input type="text" name="name">
        <input type="submit" value="提交">
    </form>

    <h1>Ajax请求数据POST</h1>
    <form id="postForm">
        <input type="text" name="name" id="name2">
        <input type="submit" value="提交">
    </form>

    <script>
        document.getElementById('button').addEventListener('click',getData);
        document.getElementById('getForm').addEventListener('submit',getForm);
        document.getElementById('postForm').addEventListener('submit',postForm);

        function getData(){
            var xhr = new XMLHttpRequest();
            xhr.open('GET',"process.php?name=Henry",true);
            xhr.onload = function(){
                console.log(this.responseText);
            }
            xhr.send();
        }   

        function getForm(e){
            e.preventDefault();
            var name = document.getElementById('name1').value;
            var xhr = new XMLHttpRequest();
            xhr.open('GET',"process.php?name="+name,true);
            xhr.onload = function(){
                console.log(this.responseText);
            }
            xhr.send();
        }   

        function postForm(e){
            e.preventDefault();
            var name = document.getElementById('name2').value;
            var params = "name="+name;
            var xhr = new XMLHttpRequest();
            xhr.open('POST',"process.php",true);
            // 设置请求头
            xhr.setRequestHeader('Content-type','application/x-www-form-urlencoded');
            xhr.onload = function(){
                console.log(this.responseText);
            }
            xhr.send(params);
        }   
    </script>
</body>
</html>

Ajax 5 - 请求PHP数据

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Ajax 5 - 请求PHP数据</title>
</head>
<body>
    <button id="button2">请求所有用户</button>

    <br><br>


    <h1>所有用户</h1>
    <div id="users"></div>

    <script>
        document.getElementById('button2').addEventListener('click',loadUsers);
        function loadUsers(){
            var xhr = new XMLHttpRequest();
            xhr.open("GET","users.php",true);
            xhr.onload = function(){
                if (this.status == 200) {
                    var users = JSON.parse(this.responseText);
                    var output = '';

                    // 遍历数组
                    for(var i in users){
                        output += 
                            '<ul>'+
                                '<li>'+users[i].id+'</li>'+
                                '<li>'+users[i].name+'</li>'+
                            '</ul>';
                        ;
                    }
                    document.getElementById('users').innerHTML = output;
                }
            }

            xhr.send();
        }

    </script>
</body>
</html>

php文件-user.php

<?php 

    $conn = mysqli_connect("localhost","root","","ajaxtest");

    $query = 'SELECT * FROM users';

    $result = mysqli_query($conn,$query);

    $users = mysqli_fetch_all($result,MYSQLI_ASSOC);

    echo json_encode($users);
 ?>

php文件-process.php

<?php 
    
    # echo "Hello World!";

    if (isset($_GET['name'])) {
        echo "GET: 你的名字是". $_GET['name'];
    }

    # 连接数据库
    $conn = mysqli_connect("localhost","root",'','ajaxtest');

    if (isset($_POST['name'])) {
        // echo "POST: 你的名字是". $_POST['name'];

        # 将拿到的数据转化一下
        $name = mysqli_real_escape_string($conn,$_POST['name']);

        $query = "INSERT INTO users(name) VALUES('$name')";
        mysqli_query($conn,"set name utf8");
        if(mysqli_query($conn,$query)){
            echo '用户添加成功!';
        }else{
            echo "用户添加失败!".mysqli_error($conn);
        }
    }
?>

json文件-user.json

{
    "id":1,
    "name":"henry",
    "email":"henry@gmail.com"
}

json文件-users.json

[
    {
        "id":1,
        "name":"Henry",
        "email":"henry@gmail.com"
    },
    {
        "id":2,
        "name":"Bucky",
        "email":"bucky@gmail.com"
    },
    {
        "id":3,
        "name":"Hemiah",
        "email":"27732357@qq.com"
    }
]

ajax

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