用http-equiv='refresh' 添加等待提示

本文介绍了一个使用ASP.NET进行页面元素加载及自动跳转的例子。通过内嵌Flash加载动画展示页面正在加载中,并设置3秒后自动跳转到首页。

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        Response.Write("<table width='386' height='176' border='0' align='center' cellpadding='0' cellspacing='0' background='http://my.863171.com/images/winting.jpg'>");
        Response.Write("<tr><td><table width='100%' height='50'  border='0' cellpadding='0' cellspacing='0'>");
        Response.Write("<tr><td width='24%' valign='bottom'><div align='center'></div></td>");
        Response.Write("<td width='14%' valign='bottom'><div align='center'>");
        Response.Write("<object classid='clsid:D27CDB6E-AE6D-11cf-96B8-444553540000' codebase='http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,29,0' width='37' height='52'>");
        Response.Write("<param name='movie' value='http://my.863171.com/images/loading.swf'>");
        Response.Write("<param name='quality' value='high'>");
        Response.Write("<embed src='http://my.863171.com/images/loading.swf' quality='high' pluginspage='http://www.macromedia.com/go/getflashplayer' type='application/x-shockwave-flash' width='37' height='52'></embed>");
        Response.Write("</object>");
        Response.Write("</div></td>");
        Response.Write("<td width='62%'> </td>");
        Response.Write("</tr></table></td>");
        Response.Write("</tr></table>");
        Response.Flush();
        Response.Write(("<meta http-equiv='refresh' content='3;url=Index.html' />"));
        Response.End();
注意content的内容格式不要写错。
from machine import Pin, I2C, PWM, Timer import time import network import socket import onewire import ds18x20 from machine import SoftI2C from ssd1306 import SSD1306_I2C #I2C的oled选该方法 # 硬件初始化 led1 = Pin(3, Pin.OUT, Pin.PULL_DOWN) # WiFi状态LED(原功能) ds18b20 = ds18x20.DS18X20(onewire.OneWire(Pin(13))) # DS18B20(GPIO15) i2c = SoftI2C(sda=Pin(47), scl=Pin(21))#创建OLED对象,OLED分辨率、I2C接口 oled = SSD1306_I2C(128, 64, i2c) buzzer = PWM(Pin(4)) # 无源蜂鸣器(PWM引脚) motor = Pin(15, Pin.OUT, value=0) # 电机继电器(初始断开,低电平启动) # WiFi配置 ssid = "end" password = "12334567" # 全局变量 TEMP_THRESHOLD = 31.0 # 温度阈值(℃) alarm_active = False # 报警状态标志 led_blink_state = False # LED闪烁状态(用于切换) buzzer.duty_u16(0) # 报警LED闪烁定时器(周期500ms) def toggle_led1(timer): global led_blink_state if alarm_active: led_blink_state = not led_blink_state led1.value(led_blink_state) # 切换LED状态 else: led1.value(0) # 非报警时关闭LED alarm_timer = Timer(1) alarm_timer.init(period=500, mode=Timer.PERIODIC, callback=toggle_led1) def read_ds_sensor(): global alarm_active roms = ds18b20.scan() if not roms: print("未检测到DS18B20传感器") alarm_active = False # 无传感器时关闭报警 return 0.0 ds18b20.convert_temp() # 启动温度转换 time.sleep_ms(750) # 等待转换完成(至少750ms) for rom in roms: temp = ds18b20.read_temp(rom) if isinstance(temp, float): temp_rounded = round(temp, 2) # 判断是否超阈值并更新报警状态 alarm_active = temp_rounded > TEMP_THRESHOLD # 控制无源蜂鸣器(报警时输出1000Hz方波) if alarm_active: buzzer.freq(1000) # 音调频率(可调整) buzzer.duty_u16(32768) # 50%占空比(音量) else: buzzer.duty_u16(0) # 关闭蜂鸣器 # 控制电机(报警时继电器吸合) motor.value(1 if alarm_active else 0) return temp_rounded alarm_active = False return 0.0 def update_oled(temp): """更新OLED显示(温度+报警状态)""" oled.fill(0) # 清屏 oled.text("Temp: {:.1f}C".format(temp), 0, 10) status = "WARNING!" if alarm_active else "Normal" oled.text("Status: " + status, 0, 30) oled.show() # 刷新显示 def wifi_connect(): wlan = network.WLAN(network.STA_IF) # STA模式 wlan.active(True) if not wlan.isconnected(): print("连接WiFi中...") wlan.connect(ssid, password) # 连接过程中LED闪烁 while not wlan.isconnected(): led1.value(1) time.sleep_ms(300) led1.value(0) time.sleep_ms(300) led1.value(0) # 连接成功后LED常灭 print("WiFi连接成功,IP:", wlan.ifconfig()[0]) return True else: print("已连接WiFi,IP:", wlan.ifconfig()[0]) return True def web_page(): temp = read_ds_sensor() html = f"""<!DOCTYPE HTML><html><head> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="refresh" content="0.1"> <!-- 关键行:0.1秒自动刷新 --> <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"> <style> html {{ font-family: Arial; text-align: center; }} h2 {{ font-size: 2.0rem; }} p {{ font-size: 1.5rem; }} .alarm {{ color: red; font-weight: bold; }} </style></head><body> <h2>ESP32 DS18B20 </h2> <p>TEMP: {temp}C / {round(temp * (9/5) + 32.0, 2)}F</p> <p class="alarm">status: {"WARNING!" if alarm_active else "normal"}</p> </body></html>""" return html if __name__ == "__main__": if wifi_connect(): my_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) my_socket.bind(('', 80)) my_socket.listen(5) print("HTTP服务器启动,等待连接...") while True: try: # 读取温度并更新OLED temp = read_ds_sensor() update_oled(temp) # 处理HTTP请求 client, addr = my_socket.accept() print(f"新连接: {addr}") request = client.recv(1024) response = web_page() client.send('HTTP/1.1 200 OK\nContent-Type: text/html\nConnection: close\n\n') client.sendall(response) client.close() except OSError as e: print(f"连接错误: {e}") if 'client' in locals(): client.close() time.sleep(0.1) # 主循环延时 分析这段代码并加入按键启动功能
最新发布
07-03
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