mozilla | 易学教程

没有Javascript,纯CSS下拉菜单-IE,FF

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd" [ <!ELEMENT a (#PCDATA | table)* > ]> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" > <head> <meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" /> <title>纯CSS下拉菜单，兼容IE和FF</title> <style type="text/css"> body {color:#fff;} #wrapper {color:#000;} .red {color:#c00;} #info {margin-top:20px;} #info h1 {font-size:3em; text-align:center; font-family: georgia, "times new roman", serif;} #head {height:145px; border:0;} #positioner {clear:both; position:relative; left

Object.create method in javascript

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问题 Being a beginner in javascript, i tried to understand Object.create() method from here https://developer-new.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Object/create In the example code, line 18. A accessor property is created with writable set to true. I also read that writable is only for data descriptors. Tried running, var o = Object.create(Object.prototype, { // foo is a regular "value property" foo: { writable:true, configurable:true, value: "hello" }, // bar is a getter

Looking for an addon to automatically select all instances of selected word in the current page

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问题 I am looking for an addon to install so that when you select a word in a webpage ( by clicking) it automatically highlights all the instances of that selected words in that text. There used to be this highlightall addon but it no longer works for recent version of Firefox! It was ver handy as all you had to do is to select that word and all instances get highlighted Such an addon would be very helpful when reading a code as you can simply select a variable name and it would select everywhere

How to improve display quality in pdf.js

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问题 I'm using open source library for PDF documents from mozilla(pdf.JS). When i'm trying to open pdf documents with bad quality, viewer displays it with VERY BAD quality. But if I open it in reader, or in browser (drag/drop into new window), whis document displays well Is it possible to change? Here is this library on github mozilla pdf.js 回答1: Maybe it's an issue related with pixel ratio, it used to happen to me when device pixel ratio is bigger than 1 (for example iPhone, iPad, etc.. you can

Creating a SWT.MOZILLA browser on Windows 64 bit and SWT 4.3

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问题 I'm trying to create an SWT Browser widget of the SWT.MOZILLA type under windows 8 64Bit with SWT 4.3 64Bit. According to this, SWT 4.3 should support 64 Bit version on XULRunner 10.x or 24.x So, I have downloaded both the 10.x and 24.x 64 versions from here and unzipped under c:\xulrunner10 and c:\xulrunner24 respectively. If I start my java app pointing to xulrunner10 (using the VM argument -Dorg.eclipse.swt.browser.XULRunnerPath=C:\xulrunner10 ) it works, however if I try with xulrunner24

Selenium 3.7 : geckodriver : WebDriverException: org.apache.http.conn.HttpHostConnectException Connection Refused

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问题 Recently I upgraded to Selenium 3.7. Code: import org.openqa.selenium.WebDriver; import org.openqa.selenium.firefox.FirefoxDriver; public static void main (String args[]){ System.setProperty("webdriver.gecko.driver", "/usr/local/bin/geckodriver"); WebDriver driver = new FirefoxDriver(); driver.get("http://www.google.com"); driver.quit(); } Included Library: selenium-java-3.7.1/selenium-server-standalone-3.7.1.jar selenium-java-3.7.1/libs/httpcore-4.4.6.jar selenium-java-3.7.1/libs/httpclient

Why changing canvas size resets its parameters?

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问题 When I change the canvas size, I notice the parameter 'mozImageSmoothingEnabled' is being reset. HTML <canvas id='canv'>Your browser don't support canvas.</canvas> Javascript var cnv = document.getElementById('canv'); var ctx = cnv.getContext('2d'); console.log(ctx.mozImageSmoothingEnabled); // default 'true' ctx.mozImageSmoothingEnabled = false; console.log(ctx.mozImageSmoothingEnabled); // shows 'false' cnv.width = 100; console.log(ctx.mozImageSmoothingEnabled); // shows 'true' JSFiddle:

关于scrapy的并行爬虫问题

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关于scrapy的并行爬虫的问题解释器和库的版本代码如下问题：解释器和库的版本 python版本：3.7 scrapy版本：1.6.0 requests库版本：2.22.0 代码如下使用requests import requests import random from multiprocessing . pool import ThreadPool url = "https://www.mzitu.com/215756" USER_AGENT_LIST = [ 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36' , "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.24 (KHTML, like Gecko) Chrome/19.0.1055.1 Safari/535.24" , "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0" , "Mozilla/5.0 (Windows NT 10.0; Win64; x64)

如何用纯 CSS 创作一个 3D 文字跑马灯特效

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效果预览在线演示按下右侧的“点击预览”按钮在当前页面预览，点击链接全屏预览。 https://codepen.io/zhang-ou/pen/GdrrZq 可交互视频教程此视频是可以交互的，你可以随时暂停视频，编辑视频中的代码。请用 chrome, safari, edge 打开观看。 https://scrimba.com/c/cWknNUR 源代码下载本地下载请从 github 下载。 https://github.com/comehope/front-end-daily-challenges/tree/master/007-3d-text-marquee-effects 代码解读定义 dom，包含2组重复的文字： <div class="box"> <div class="inner"> <span>Hello World</span> </div> <div class="inner"> <span>Hello World</span> </div> </div> <p>居中显示：</p> html, body { height: 100%; display: flex; align-items: center; justify-content: center; } <p>设置容器的尺寸和文字样式：</p> .box { display: flex; }

如何用 CSS 创作一个立体滑动 toggle 交互控件

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效果预览在线演示按下右侧的“点击预览”按钮在当前页面预览，点击链接全屏预览。 https://codepen.io/zhang-ou/pen/zjoOgX 可交互视频教程此视频是可以交互的，你可以随时暂停视频，编辑视频中的代码。请用 chrome, safari, edge 打开观看。 https://scrimba.com/c/cPvMzTg 源代码下载本地下载请从 github 下载。 https://github.com/comehope/front-end-daily-challenges/tree/master/005-sleek-sliding-toggle-checkbox 代码解读定义 dom，是嵌套了3层的容器： <div class="checkbox"> <div class="inner"> <div class="toggle"></div> </div> </div> 居中显示： html, body, .checkbox, .checkbox .inner, .checkbox .inner .toggle { height: 100%; display: flex; align-items: center; justify-content: center; } 画出外侧椭圆： .checkbox { width: 10em;