JS语言基础 - 技术栈

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学习js语言的基础
这是文件上传的代码
upload.html


<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>简单文件上传</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            max-width: 600px;
            margin: 0 auto;
            padding: 20px;
        }
        .upload-container {
            border: 2px dashed #ccc;
            padding: 20px;
            text-align: center;
            border-radius: 5px;
        }
        .upload-btn {
            background-color: #4CAF50;
            color: white;
            padding: 10px 20px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 16px;
            margin-top: 15px;
        }
        .upload-btn:hover {
            background-color: #45a049;
        }
        .note {
            font-size: 14px;
            color: #666;
            margin-top: 10px;
        }
    </style>
</head>
<body>
<h1>文件上传</h1>
<form action="upload.php" method="post" enctype="multipart/form-data">
    <div class="upload-container">
        <h3>选择要上传的文件</h3>
        <input type="file" name="file" id="file" οnchange="CheckFileExt(this.value)">
        <p class="note">注意：实际文件上传需要服务器端处理脚本</p>
        <button type="submit" class="upload-btn">上传文件</button>
    </div>
</form>

<script>

    function CheckFileExt(filename){
        //定义白名单
        var exts=['png','gif','jpg','mp4'];
        //以.分割传递参数
        var index=filename.lastIndexOf(".");
        //拿到分割的后面数据
        var ext= filename.substr(index+1)
        for(i=0;i<exts.length;i++){
            //后缀名匹配成功
            if (ext == exts[i]){
                var flag = true;
                alert("zque");
                break
            }
        }
        if (!flag){
            alert('cuol');
            local.reload(true);
        }
    }




</script>


</body>
</html>

upload.php

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<?php
//拿到上传文件并保存文件
$name = $_FILES['file']['name'];
$type = $_FILES['file']['type'];
$size = $_FILES['file']['size'];
$temp_name = $_FILES['file']['tmp_name'];
$error = $_FILES['file']['error'];

move_uploaded_file($temp_name, './'.$name);

这是一个简单的登录界面可以在js做认证也可以在php中进行认证

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<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>后台登录</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Microsoft YaHei', Arial, sans-serif;
        }

        body {
            background-color: #f5f5f5;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }

        .login-container {
            background-color: white;
            border-radius: 8px;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
            padding: 40px;
            width: 100%;
            max-width: 400px;
            text-align: center;
        }

        .login-title {
            font-size: 24px;
            color: #333;
            margin-bottom: 30px;
            font-weight: 600;
        }

        .form-group {
            margin-bottom: 20px;
            text-align: left;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: #555;
            font-size: 14px;
        }

        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 14px;
            transition: border-color 0.3s;
        }

        .form-control:focus {
            border-color: #409eff;
            outline: none;
        }

        .login-btn {
            width: 100%;
            padding: 12px;
            background-color: #409eff;
            color: white;
            border: none;
            border-radius: 4px;
            font-size: 16px;
            cursor: pointer;
            transition: background-color 0.3s;
            margin-top: 10px;
        }

        .login-btn:hover {
            background-color: #66b1ff;
        }

        .footer {
            margin-top: 20px;
            color: #999;
            font-size: 12px;
        }
    </style>
</head>
<body>
<div class="login-container">
    <h1 class="login-title">后台登录</h1>


        <div class="form-group">
            <label for="username">用户名：</label>
            <input type="text" name="username" id="username" class="user" placeholder="请输入用户名">
        </div>

        <div class="form-group">
            <label for="password">密码：</label>
            <input type="password" name="password" id="password" class="pass" placeholder="请输入密码">
        </div>

        <button type="submit" class="login-btn">登录</button>


    <div class="footer">
        ©2023 系统后台管理
    </div>
</div>

//调用jquery模块
//这是一个html美化的模块
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
    $("button").click(function(e) {//点击submit后执行funcation
        e.preventDefault(); // 阻止表单提交
//调用模块方法
        $.ajax({
            //定义一下传递的参数
            type: 'POST',
            url: 'login.php',
            data: {
                //接收传参
                myuser: $('.user').val(),
                mypass: $('.pass').val()
            },
            //成功后的动作
            success: function(res) {
                //判定数值的正确
                if (res['infoCode']==1){
                    alert('cg')
                    window.location.href = res.redirect; // 使用服务器返回的跳转地址
                    // location.href='index.php';
                }else {
                    alert('404')
                }

            },
            error: function(xhr, status, error) {
                console.error("请求失败:", error);
            },
            dataType: 'json'
        });
    });
</script>
</body>
</html>

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<?php
header('Content-Type: application/json'); // 声明返回 JSON 格式

$user = $_POST['myuser'] ?? '';
$pass = $_POST['mypass'] ?? '';
//真实情况下要去数据库判断啊
$success = array('msg' => 'ok');//声明一个数组 进行初始化

if($user == 'admin' && $pass == '123456'){
    $success['infoCode'] = 1;
    $success['redirect'] = 'index.php';  // 添加跳转地址到JSON响应中
}else{
    $success['infoCode'] = 0;
}

echo json_encode($success);// 返回 JSON 数据


?>

这是一个提交数据界面

shop.html

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<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>商品购买</title>
</head>
<body>
<table border="0" cellpadding="10" cellspacing="0" align="center">
    <tr>
        <td colspan="2" align="center">
            <img src="iphone.jpg" width="300" height="300" alt="iPhone图片">
        </td>
    </tr>
    <tr>
        <td align="right"><b>金钱：</b></td>
        <td>10000</td>
    </tr>
    <tr>
        <td align="right"><b>商品价格：</b></td>
        <td>8888</td>
    </tr>
    <tr>
        <td align="right"><b>数量：</b></td>
        <td>
            <input type="text" name="number" class="number" size="5">
            <button>购买</button>
        </td>
    </tr>
</table>
</body>
//调用模块
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
    $("button").click(function(e) {
        e.preventDefault(); // 阻止表单提交

        $.ajax({
            type: 'POST',
            url: 'shop.php',
            data: {
                num: $('.number').val()
            },
            success: function(res) {
                if (res['infoCode']==1){
                    alert('cg')
                    window.location.href = res.redirect; // 使用服务器返回的跳转地址
                    // location.href='index.php';
                }else {
                    alert('404')
                }

            },
            error: function(xhr, status, error) {
                console.error("请求失败:", error);
            },
            dataType: 'json'
        });
    });
</script>
</html>

shop.php

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<?php

header('Content-Type: application/json'); // 声明返回 JSON 格式

$num = $_POST['num'] ?? '';

$success = array('msg' => 'ok');//声明一个数组 进行初始化

if (10000>(8888*$num)) {
    $success['infoCode'] = 1;
    $success['redirect'] = 'index.php';  // 添加跳转地址到JSON响应中
} else {
    $success['infoCode'] = 0;
}

echo json_encode($success);// 返回 JSON 数据

简单的js使用方法