h2 builders

#content div#main-content h2{ 02 color:red; 03 } 04 05 #content #main-content>h2{ 06 color:blue 07 } 08 body #content div[id="main-content"]

It's a long time to explain JavaScript inheritance. If you don't talk nonsense, go to the topic.Now that you want to learn about inheritance, it proves that you have a certain understanding of JavaScript object-oriented. If you have any questions, refer to the basic knowledge of object-oriented in JavaScript, next, we will generally use these methods to inherit JavaScript.Prototype chainThe simplest way to implement inheritance in JavaScript is to use the prototype chain to direct the pr

Guide Since the release of the official version of the HTTP/2 agreement from May 14, 2015 to now has been almost a year, more and more sites deployed HTTP2,HTTP2 's wide range of applications to bring a better browsing experience, as long as the modern browser is supported, so deployment HTTP2 does not bring too much trouble. Although the H2 H2C (HTTP/2 Cleartext) can be transmitted over a non-encrypted channel, but the supported brows

For the front end, to understand the priority of CSS style, to develop or deal with the bug has a multiplier effect, today in the project, suddenly encountered a priority small problem, just at the beginning do not know the cause, later found that the problem is caused by priority. Describe the problem first, when the mouse hovers over the parent container, the child container appears, and the move disappears. See this problem, some people may want to spray, this and priority has a yarn relation

(); Input.select (); }, 0); } Get ('INPUT1'). onkeypress= function() {Get ('Preview1'). InnerHTML= This. Value; } Get ('Input2'). onkeypress= function() {setTimeout (function() {Get ('Preview2'). InnerHTML=Get ('Input2'). Value; },0 ); } } })(); Script>Head>Body>H1>Code>DEMO1Code>H1>H2>1, not usedCode>SetTimeoutCode>(text box content is not selected)H2>ButtonID= "Ma

A good explanation of JavaScript inheritance, but slow to explain now. Don't say much nonsense, go straight to the chase.Since you want to understand the inheritance, prove that you have a certain understanding of JavaScript object-oriented, such as what is not understood can refer to the "Object-oriented JS basic explanation, Factory mode, constructor mode, prototype mode, mixed mode, dynamic prototype mode", The next step is to complete the JavaScript inheritance through those methods.　Prototy

A good explanation of JavaScript inheritance, but slow to explain now. Don't say much nonsense, go straight to the chase.Since you want to understand the inheritance, prove that you have a certain understanding of JavaScript object-oriented, such as what is not understood can refer to the "Object-oriented JS basic explanation, Factory mode, constructor mode, prototype mode, mixed mode, dynamic prototype mode", The next step is to complete the JavaScript inheritance through those methods.　Prototy

. Second: Represents the ID selector, such as: #content, the weight value is 100. Third class: Represents classes, pseudo-classes, and attribute selectors, such as. Content, with a weight of 10. Class IV: Represents a type selector and a pseudo-element selector, such as Div p, with a weight of 1. For example, where #nav is a second-level selector,. Active is a third-class selector, with UL, Li and a four selectors. The value of the specificity of the entire selector expression

, you can see a similar line in the error log: [Timestamp] [Http2:info] [PID xxxxx:tid numbers] MOD_HTTP2 (v1.0.0, NGHTTP2 1.3.4), initializing ... AgreementWell, suppose you've compiled the server, the TLS library is up to date, you start your server, you open the browser ... How do you know it's working? If you don't add other server configurations, it's probably not working. You need to tell the server where to use the protocol. By default, your server does not start the HTT

--unsigned long (always bit, big endian byte)V--unsigned long (always bit, little endian byte order)F--Float (machine dependent size and representation)D--double (machine dependent size and representation)X--NUL byteX--Back up one byte@--Nul-fill to absolute position====================h and h========================-------------------------H--H------------------------------First look at Chinese translationH 16 carry string, high in frontH 16 carry string, low in frontRead English againH--Hex st

the nearest sample of the two classes is the same, and the maximum. In order to better illustrate, we found two in the hyper plane parallel to and equidistant from the plane: H1:y = wtx + b=+1 and h2:y = wtx + b=-1.Well, then we need two conditions: (1) There is no sample between the two planes; (2) The distance between the two planes needs to be maximum. (For any H1 and H2, we can normalized the coefficie

= $ ("#myid"); var dom = $dom [0]; = function () { if(DOM.checked= =true) { alert ( " Success " ); } } }You can convert a DOM object to a jquery object to use the rich functionality provided by jquery, or you can convert a jquery object to a DOM object, using the functionality provided by members unique to the DOM object.jquery SelectorBasic SelectorMainly include: Tag Selector, class selector, ID selecto

a JS error, that is because get JS version of the H2, I stole a lazy, the JQ also traversed. I think that the actual application, there will be no one effect, while using JS side with JQ bar. Core code point this view sample Copy Code code as follows: Original JS version * * * start Window.onload=function () { Shared function Area var ibase={ document.getElementById Id:function (name) {return document.getElementById (name)}, Get el

complex explanations above. instance of the call () method So he wrote another hello,world: Copy Code code as follows: function Print (p1, p2) { Console.log (p1 + ' + p2 '); } Print ("Hello", "World"); Print.call (Undefined, "Hello", "World"); Both methods have the same output, however, in contrast to the call method, a undefined is also passed. Next, we'll look at another example. Copy Code code as follows: var obj=function () {}; function Pri

In search engine internal optimization has a "H" font label optimization, reasonable use can enhance the whole site keyword weight, and even bring a lot of long tail words. In actual optimization, however, the A5 optimization team (http://seo.admin5.com) found a large number of Web sites incorrectly using H tags, or not using H tags at all. How to optimize the website with h tag? This article gives the following suggestions: One: What is the H tag? The consortium points out that the H1-h6 tag

nginxloganalyzer function for log analysis, is the default Nginx log, this does not use the regular, using the soil method to find specific characters. def nginxloganalyzer (line): #print (line) G1 = Line.find (' [') g2 = Line.find ('] ') h1 = Line.find (' "') h 2 = Line.find (' "', h1+1) h3 = Line.find ('" ', h2+1) h4 = Line.find (' "', h3+1) h5 = Line.find ('" ', h4+1) h6 = Line.find (' "', h5+1) #print (" g1:%d "%g1) #print (" g2:%d "%g2) #print (

collector that automatically counts objects that have not been referenced, but this job is on Objective-C and must be done by programmers. The above example is purely intended to show retain, release, and retainCount. The programmer forces retain and release to change the reference quantity statistical value (the reference quantity has not changed, of course ), the actual operation will certainly not do this. Let's take a look at the following example. House * h1 = [House new]; // a reference

input_data mnist = input_data.read_data_sets ("MNIST_data/", one_hot = False) learning_rate = 0.01 training_epochs = 10 batch_size = 256 display_step = 1 examples_to_show = 10 n_input = 784 # tf Graph input (only pictures) X = tf. placeholder ("float", [None, n_input]) # Dictionary-based storage of the parameters n_hidden_1 = 256 # number of neurons in the first encoding layer n_hidden_2 = 128 # number of neurons in the second encoding layer # Changes in weights and bias in the encoding and dec

The vertical navigation menu is also an important form of web application, and the so-called vertical navigation menu refers to a navigation form arranged from top to bottom on the left or right side of the page. Let's look at the effect first! Effect, let's look at the code structure first: Css Getting Started with CSS CSS Advanced CSS Advanced WebUI Theoretical knowledge Actual application Advanced Techniques Dom Getting Started with Dom Dom App Dom and browser Xh

running, prompt that the installation is successful. Next we need to install some necessary components. To facilitate installation, add pip to the environment variable first. Now we can use the pip command to install the component. First paste sina_news.py to observe which components are needed. import requestsfrom bs4 import BeautifulSoupres = requests.get('http://news.sina.com.cn/china/')res.encoding = 'utf-8'soup = BeautifulSoup(res.text,'html.parser')for news in soup.select('.news-item'): i