我需要自动化HTML 5视频播放器页面及其缩略图的屏幕截图,但在查看一些比较流行的无头浏览器(如PhantomJS)后,它们不支持HTML 5视频.
>phantomjs examples\features.js
Detected features (using Modernizr 2.0.6):
Supported:
touch
generatedcontent
fontface
flexbox
canvas
canvastext
postmessage
websqldatabase
hashchange
history
draganddrop
websockets
rgba
hsla
multiplebgs
backgroundsize
borderimage
borderradius
boxshadow
textshadow
opacity
cssanimations
csscolumns
cssgradients
cssreflections
csstransforms
csstransitions
localstorage
sessionstorage
webworkers
applicationcache
svg
inlinesvg
smil
svgclippaths
Not supported:
csstransforms3d
webgl
geolocation
indexeddb
video
audio
需要注意的是HTML 5视频不支持上面,什么轻便无头的浏览器DOES支持HTML 5视频？
下面是我简单的AppDelegate.swift类.
// AppDelegate.swift
import Cocoa
@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {
func applicationDidFinishLaunching(aNotification: NSNotification) {
NSEvent.addGlobalMonitorForEventsMatchingMask(NSEventMask.KeyDownMask, handler: keyDown);
}
func keyDown(event:NSEvent!) {
print("key down is \(event.keyCode)");
}
}
怎么没有打印关键事件？我错过了什么？我试过四处寻找,但无法弄明白.
我想要完成的事情可以在这里找到jsbin。标签的顶部和底部之间需要一些空间，但是每当我尝试添加这样的边距时：
.label-default {
margin-bottom: 5px;
}
没有任何变化，也没有添加边距。如何添加边距以使它们不那么混乱？
CSS
body {
background-color: #2d2d30;
}
.categories {
padding: 25px;
text-align: center;
margin:auto;
left: 0;
right: 0;
}
.panel-default {
background-color: rgba(0,0,0,0);
border: 0px solid;
box-shadow: 0px;
}
.label-default {
background-color: rgba(0,0,0,0.2);
font-size: 12px;
}
.label-highlight {
background-color: rgba(255,255,255,0.2);
font-size: 12px;
}
.break {
margin-top:-10px;
display:block;
}
超文本标记语言
<div class="panel panel-default" style='text-align:center;max-width:960px;margin:auto;left:0;right:0;'>
<p style='color:#fefefe;font-size:24px;font-weight:300;'>How can I add padding to the bottom of each label?</p>
<div class="panel-body">
<span class="label label-default pad">Default</span>
<span …我有一组看起来像这样的字符串:
[{"tag":"rat","score":0.7973},{"tag":"lion","score":0.7184},{"tag":"dog","score":0.2396},{"tag":"woof","score":0.1944},{"tag":"cat","score":0.1157}]
我想从字符串中按顺序打印以下内容:
rat
lion
dog
woof
cat
我怎样才能做到这一点？