我是Prolog的新手.我只是想简单的例子来学习.我有.pl这些行的这个文件:
parent(pam,bob).
parent(tom,bob).
parent(tom,lio).
parent(bob,ann).
parent(bob,pat).
parent(pat,jim).
Run Code Online (Sandbox Code Playgroud)
咨询和测试后,它只显示第一个答案.例如:
5 ?- parent(X,Y).
X = pam,
Y = bob .
Run Code Online (Sandbox Code Playgroud)
是不是应该给出满足关系的所有组合parent?
有谁知道问题是什么?
我的Xampp控制面板出现问题.一旦我尝试启动它,它会弹出一条错误消息:
"错误:无法创建文件"C:\ xampp\xampp-control.ini".访问被拒绝.
我安装的版本是xampp-win32-5.6.23.当我尝试启动apache模块时,下面是log respnse:
7:53:14 PM [Apache] Attempting to start Apache app...
7:53:15 PM [Apache] Status change detected: running
7:53:17 PM [Apache] Status change detected: stopped
7:53:17 PM [Apache] Error: Apache shutdown unexpectedly.
7:53:17 PM [Apache] This may be due to a blocked port, missing dependencies,
7:53:17 PM [Apache] improper privileges, a crash, or a shutdown by another method.
7:53:17 PM [Apache] Press the Logs button to view error logs and check
7:53:17 PM [Apache] the Windows Event Viewer …Run Code Online (Sandbox Code Playgroud) 我创建了一个 PHP 页面以从我的数据库中删除。这个 PHP 页面是表单提交的操作。表格是通过点击“X”标志的图片提交的。如何在提交表单之前要求用户确认并从我的数据库中删除?
这是我的代码:
<form method='POST' action='delete.php'><input type='image' src='images/delete.png' class='del' alt='Submit Form' />
Run Code Online (Sandbox Code Playgroud)
我试图通过将它添加到我的表单标签来内联执行它,但它不起作用:
onsubmit="return confirm('Are you sure you want to submit this form?');"
Run Code Online (Sandbox Code Playgroud) 我是 Python 新手,我想使用 Python 连接到 Firebase。我可以使用put()and成功添加和修改 Firebase patch(),但找不到从 Firebase 检索数据的方法。
代码:
import serial
import time
import requests
import json
firebase_url = 'https://testing1639.firebaseio.com'
#Connect to Serial Port for communication
ser = serial.Serial('/dev/ttyUSB0', 9600)
#Setup a loop to send temperature values at fixed intervals in seconds
fixed_interval = 2
while 1:
try:
#Temperature value obtained from Arduino + LM35 Temp Sensor
temperature_c = ser.readline()
#Current time and date
time_hhmmss = time.strftime('%H:%M:%S')
date_mmddyyyy = time.strftime('%d/%m/%Y')
#Current location name
temperature_location = …Run Code Online (Sandbox Code Playgroud) 我正在尝试管理HTML表,添加和删除行。我想做的是通过单击元素()删除整行。但是,当单击一个元素时,所有标签的父元素都将被删除。无论如何,都可以指定被单击的元素,并仅删除专门针对此类可调整表的可包含和删除行的包含该元素的行。
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("td").click(function(){
$("td").parentsUntil("table").remove();
});
});
</script>
</head>
<body>
<table border="1">
<tr><td>test1</td><td>test2</td><td>test3</td><td>test4</td></tr>
<tr><td>test5</td><td>test6</td><td>test7</td><td>test8</td></tr>
</table>
</body>
</html>Run Code Online (Sandbox Code Playgroud)