JS语言基础
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
<?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, './'.$name);
这是一个简单的登录界面 可以在js做认证 也可以在php中进行认证
login.html
<!DOCTYPE html>
<html lang="zh-CN">
<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>后台登录</title><style>* {margin: 0;padding: 0;box-sizing: border-box;font-family: 'Microsoft YaHei', Arial, sans-serif;}body {background-color: #f5f5f5;display: flex;justify-content: center;align-items: center;height: 100vh;}.login-container {background-color: white;border-radius: 8px;box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);padding: 40px;width: 100%;max-width: 400px;text-align: center;}.login-title {font-size: 24px;color: #333;margin-bottom: 30px;font-weight: 600;}.form-group {margin-bottom: 20px;text-align: left;}.form-group label {display: block;margin-bottom: 8px;color: #555;font-size: 14px;}.form-control {width: 100%;padding: 12px 15px;border: 1px solid #ddd;border-radius: 4px;font-size: 14px;transition: border-color 0.3s;}.form-control:focus {border-color: #409eff;outline: none;}.login-btn {width: 100%;padding: 12px;background-color: #409eff;color: white;border: none;border-radius: 4px;font-size: 16px;cursor: pointer;transition: background-color 0.3s;margin-top: 10px;}.login-btn:hover {background-color: #66b1ff;}.footer {margin-top: 20px;color: #999;font-size: 12px;}</style>
</head>
<body>
<div class="login-container"><h1 class="login-title">后台登录</h1><div class="form-group"><label for="username">用户名：</label><input type="text" name="username" id="username" class="user" placeholder="请输入用户名"></div><div class="form-group"><label for="password">密码：</label><input type="password" name="password" id="password" class="pass" placeholder="请输入密码"></div><button type="submit" class="login-btn">登录</button><div class="footer">©2023 系统后台管理</div>
</div>//调用jquery模块
//这是一个html美化的模块
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>$("button").click(function(e) {//点击submit后执行funcatione.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: $('.pass').val()},//成功后的动作success: function(res) {//判定数值的正确if (res['infoCode']==1){alert('cg')window.location.href = res.redirect; // 使用服务器返回的跳转地址// location.href='index.php';}else {alert('404')}},error: function(xhr, status, error) {console.error("请求失败:", error);},dataType: 'json'});});
</script>
</body>
</html>
login.php
<?php
header('Content-Type: application/json'); // 声明返回 JSON 格式$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($success);// 返回 JSON 数据?>
这是一个提交数据界面
shop.html
<!DOCTYPE html>
<html lang="zh-CN">
<head><meta charset="UTF-8"><title>商品购买</title>
</head>
<body>
<table border="0" cellpadding="10" cellspacing="0" align="center"><tr><td colspan="2" align="center"><img src="iphone.jpg" width="300" height="300" alt="iPhone图片"></td></tr><tr><td align="right"><b>金钱：</b></td><td>10000</td></tr><tr><td align="right"><b>商品价格：</b></td><td>8888</td></tr><tr><td align="right"><b>数量：</b></td><td><input type="text" name="number" class="number" size="5"><button>购买</button></td></tr>
</table>
</body>
//调用模块
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>$("button").click(function(e) {e.preventDefault(); // 阻止表单提交$.ajax({type: 'POST',url: 'shop.php',data: {num: $('.number').val()},success: function(res) {if (res['infoCode']==1){alert('cg')window.location.href = res.redirect; // 使用服务器返回的跳转地址// location.href='index.php';}else {alert('404')}},error: function(xhr, status, error) {console.error("请求失败:", error);},dataType: 'json'});});
</script>
</html>
shop.php
<?phpheader('Content-Type: application/json'); // 声明返回 JSON 格式$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