block | 易学教程

CSS居中完全指南——构建CSS居中决策树

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CSS居中完全指南——构建CSS居中决策树本文总结CSS居中,包括水平居中和垂直居中.本文相当于CSS决策树,下次再遇到CSS居中问题时有章可循. 参考 Centering in CSS: A Complete Guide 和【基础】这15种CSS居中的方式，你都用过哪几种本文的引用归原作者所有. 代码在线演示工具 JSbin使用指南 1.Horizontally 水平居中 1.1 inline 或 inline-* 元素水平居中给需要居中的元素一个 block 父元素,需要居中子元素为文本或者 inline , inline-block , inline-table , inline-flex 核心代码 .center-children { text-align: center; } JSbin演示地址效果: 1.2 block 元素水平居中父元素为 block ,子元素也为 bolck ,且子元素设置了宽度 (没宽度子元素就继承父元素宽度,居中没有意义). 无论正在居中块级元素的宽度或父级的宽度如何，都会起作用。方法:子元素 margin: 0 auto; 左右外边距设置为自动填充核心代码 .center-me { margin: 0 auto; } 效果: block 元素水平居中JSbin演示地址 1.3多个 block 元素水平居中 1.3.1 多个

How do you remove a CAEmitterLayer when it ends the lifetime of it's CAEmitter Cells — instead of repeating until you remove it from super layer

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I am using generic code (from the iOS Fireworks demo) in a slightly changed way. I have the following in a subclass of UIView. What I want is to make the firework appear at the point the user touches (not hard) and play out for the length of the CAEmitterLayer/CAEmitterCells 'lifetime'. Instead, this is immediately starting when i add it to addSublayer -- like I am sure it is meant to. However, I would like to use it in a slightly different way. Is there a way that I can change this so there is a CATransaction with a completion block (to removeFromSuperlayer) or something like that? Any ideas

Hadoop - how are map-reduce tasks know which part of a file to handle?

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I've been starting to learn hadoop, and currently I'm trying to process log files that are not too well structured - in that the value I normally use for the M/R key is typiclly found at the top of the file (once). So basically my mapping function takes that value as key and then scans the rest of the file to aggregate the values needed to be reduced. So a [fake] log might look like this: ## log.1 SOME-KEY 2012-01-01 10:00:01 100 2012-01-02 08:48:56 250 2012-01-03 11:01:56 212 .... many more rows ## log.2 A-DIFFERENT-KEY 2012-01-01 10:05:01 111 2012-01-02 16:46:20 241 2012-01-03 11:01:56 287 .

django 之视图层及模板层 04

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目录视图层 render方法是Template和Contex两个对象的组合使用 JsonResponse对象 CBV及源码分析 CBV 加装饰器的方式模板层模板语法传值模板语法变量过滤器（Filters）标签自定义过滤器和标签自定义过滤器自定义标签自定义inclusion_tag 模板的继承模板的导入路由：视图函数的内存地址视图层 render方法是Template和Contex两个对象的组合使用 from django .template import Template,Context def func1(request): res = Template('<h1>{{user}}</h>') con=Context({'user':{'username':'zhang','password':123,}}) return HttpResponse(res.render(con)) JsonResponse对象 JsonResponse是HttpResponse的子类，专门用来生成JSON编码的响应。 # ensure_ascii=False 默认等于True，设置成False，遇到中文不再进行转码，仅仅只是进行序列化，转换成json形式的字符串 import json def func(request): d={'a':1,'b':3,'c':3,

In what order are initializer block and variable definitions and etc. executed? (in java)

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问题 I have problem understanding the order in which initialization happens. this is the order I assumed: *Once per 1. Static variable declaration 2. Static block *Once per object 3. variable declaration 4. initialization block 5. constructor but according to this code I am obviously wrong: class SomethingWrongWithMe { { b=0; //no. no error here. int a = b; //Error: Cannot reference a field before it is defined. } int b = 0; } And the error would disappear if I do this: class SomethingWrongWithMe

一百一十：CMS系统之剩余菜单栏的页面和视图

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增加所有剩余菜单的页面，并用视图渲染，方便后面调试权限控制 {% extends 'cms/cms_base.html' %}{% block title %}板块管理{% endblock %}{% block head %}{% endblock %}{% block page_title %} {{ self.title() }}{% endblock %}{% block main_content %} 板块管理页面{% endblock %} {% extends 'cms/cms_base.html' %}{% block title %}评论管理{% endblock %}{% block head %}{% endblock %}{% block page_title %} {{ self.title() }}{% endblock %}{% block main_content %} 评论管理页面{% endblock %} {% extends 'cms/cms_base.html' %}{% block title %}CMS角色管理{% endblock %}{% block head %}{% endblock %}{% block page_title %} {{ self.title() }}{% endblock %}{% block main

“Converting” a function pointer to a block in objective-C

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问题 I'm doing some Interop from Mono C# to Obj-C and ran into this problem. The C# code needs to pass a callback - which it does with a function pointer. I can get the function pointer from the Obj-C side and call it and everything works. But I now need to give that function pointer as a callback to third party API which works with blocks as a callback. I want the third party to call the C# function - so in a way i'm trying to either convert the function pointer to a block so the third party can

HDFS的实现思想

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1、hdfs是通过分布式集群来存储文件，为客户端提供了一个便捷的访问方式，就是一个虚拟的目录结构 2、文件存储到hdfs集群中去的时候是被切分成block的 3、文件的block存放在若干台datanode节点上 4、hdfs文件系统中的文件与真实的block之间有映射关系，由namenode管理 5、每一个block在集群中会存储多个副本，好处是可以提高数据的可靠性，还可以提高访问的吞吐量来源： https://www.cnblogs.com/starsyh/p/11929916.html

Haproxy 使用block 阻止域名访问到某个子目录报403

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配置教程如下： 1 acl is_https_com hdr_beg(host) www.baidu.com #定义规则域名 2 acl api_block_url_web url_dir -i /web/ #定义阻止目录 3 acl api_block_url_app url_dir -i /app/ #定义阻止目录 4 block if api_block_url_web is_https_com #如果只是单个子目录限制访问使用此项配置 5 block if api_block_url_web is_https_com || api_block_url_app is_https_com #如果出现多个子目录文件夹限制，需要使用 "或 "表达式 "||" 做判断 6 7 8 block if api_block_url_web !is_https_com #除is_https_com 之个规则之外所有域名规则都阻止访问web 目录 ACL 规则来源： https://www.cnblogs.com/itusye/p/9615824.html

OSX Blocking JNLP Launch Java1.8U40 - Anyone Know Why?

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We deploy our application as a JNLP launch file and/or as a webpage applet. I have a customer that updated his MAC OSX system to the latest Java Version 1.8_40. After upgrading the JNLP launch stopped working. It seems to start Java (flashes blue java logo) then stops. No Exception is thrown. I suspect yet another OSX security hurdle. We adjusted his OSX Security settings to trust our application. We adjusted his Java security to trust our site. We also adjusted the Safari preferences to allow the application to run unrestricted ("unsafe mode"). The application is signed with a code signing

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