以ESP8266为服务端，当用户的访问设备与ESP8266在同一个Wi-Fi下时，可以通过ESP8266的IP地址来访问控制灯光开关的页面。
使用方法：
第一步、将下面的代码修改过Wi-Fi名称和密码后烧录到ESP中；
第二步、打开串口调试工具，查看该ESP的IP地址；
第三步、访问 IP地址/index.html 页面，通过页面的两个按钮控制灯的开关；
代码如下：
#include <ESP8266WiFi.h> const char* ssid = "Wi-Fi名称"; const char* password = "Wi-Fi密码"; WiFiServer server(80); void setup() { pinMode(D4, OUTPUT); Serial.begin(115200); delay(10); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(""); Serial.println("WiFi connected"); // Start the server server.begin(); Serial.println("Server started"); // Print the IP address Serial.println(WiFi.localIP()); } void loop() { // Check if a client has connected WiFiClient client = server.available(); if (!client) { return; } // Wait until the client sends some data Serial.println("new client connected"); while(!client.available()){ delay(1); } // Read the first line of the request String req = client.readStringUntil(' '); Serial.println(req); client.flush(); // Prepare the response String page = "HTTP/1.1 200 OK Content-Type: text/html <!DOCTYPE HTML> <html> <head>"; page += "<meta charset='utf-8'>"; page += " <link href='https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css' rel='stylesheet'>"; page += " <script src='https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.js'></script>"; page += " </head> <body style='padding:10px'>"; page += " <button class='btn btn-success zp-open' style='100%; height:100px;'>开启</button><br>"; page += " <button class='btn zp-close' style='100%; margin-top:10px; height:100px;'>关闭</button>"; page += " <script> "; page += "$('.zp-open').click(function(){$.post('/gpio/1', {}, function(){alert('开启成功');})});"; page += " "; page += "$('.zp-close').click(function(){$.post('/gpio/0', {}, function(){alert('关闭成功');})});"; page += " </script>"; page += " </body> </html> "; String json = "HTTP/1.1 200 OK Content-Type: text/html success"; // Match the request int val; if (req.indexOf("/gpio/0") != -1) { val = 0; } else if (req.indexOf("/gpio/1") != -1) { val = 1; } else if (req.indexOf("/index.html") != -1) { client.print(page); return; } else { Serial.println("invalid request"); client.stop(); return; } digitalWrite(D4, val); client.print(json); delay(1); }