grc meaning

Javascript: void (0) is often used in javascript. Do you know this is contained? In Javascript, void is an operator that specifies to calculate an expression but does not return a value, this article introduces the true meaning of javascript: void (0) in Javascript. For more information, see if void is an operator in javascript. This operator specifies that an expression is to be calculated but no return value is returned. I want to use the following

callback function to see if the data is ready (equals 4).If you are not ready, check again at intervals. Because the data is not finished downloading, we cannot use its properties and methods. If you are ready, proceed to execution; Lreadystate PropertyThe ReadyState property indicates several states in which the XMLHttpRequest object is in the process of sending/receiving data. The XMLHttpRequest object undergoes 5 different states.• 0: Uninitialized. Object has been created, but not initializ

constructor A to find, finally found A.prototype.whatever, so it returned to B.prototype whatever, and then returned to B.whateverThis realizes the inheritance relationship of the prototype chain.B.whatever==b.prototype.whatever==a.prototype.whateverThe purpose of this is that B completely inherits the thing of a, as long as there is a prototype, B's instance (generated by new B) can be obtained.However, modifying the properties and methods of an instance does not affect the class (well, JS doe

About the meaning of the Pc_tag () method in module _tag.class.php in Phpcms: in the PHPCMS system to write their own background module, in the foreground template to be displayed in the \phpcms\modules\ custom module name \classes\ folder to write a "module name _tag.class.php" file, This file outputs the custom PC label used by the front module board, and the method in the label definition class how to write I'm not going to go into this here, beca

)**************************************************************************Simple to understand is (function ($) {...}) (jQuery) defines a number of functions that need to be pre-definedThe $ (function () {}) is used to run \ Execute those preprint-defined functions after the DOM loading is complete.**************************************************************************Share some of the lessons learned when developing jquery plugins. First, look atJQuery (function () {}), all written asJQuery

What is the meaning of $this in thinkphp? Reply content: What is the meaning of $this in thinkphp? $this is the current object reference, it's PHP, it doesn't matter with thinkphp. Represents the current object, in different places of different meanings, to see the specific code. The other upstairs +1 $this must be a PHP keyword that appears inside the class to represent the current object, ty

[Data sorting] MySQL error code meaning bitsCN.com [Data sorting] meaning of MySQL error codes The MySQL error code is retained for future reference. 1005: An error occurred while creating the table. 1006: database creation failed 1007: The database already exists. An error occurred while creating the database. 1008: The database does not exist. An error occurred while deleting the database. 1009: the dat

The following small series will provide you with an explanation of the meaning of the XHProf Report field. I think it is quite good. now I will share it with you and give you a reference. Let's take a look at it with Xiaobian. Function Name: method Name. Cils: the number of times a method is called. Cils %: percentage of the number of method Calls in the total number of Calls to the same level. Incl. Wall Time (microsec): The Time taken to execu

In C #?? What's the meaning of the distinction?1. Nullable type modifier (? ):A reference type can use a null reference to represent a value that does not exist, and a value type usually cannot be represented as empty. For example: string str=null; is correct, int i=null; the compiler will error. To make a value type nullable, you can use a nullable type, which is the nullable type modifier "? "To indicate that the representation is" T? "for example:

One, the normal for loop we have been exposed to a lot, as below, we all understand int [] tt = {1,2,3,4,5,6 }; for (int16; i++) { Console.WriteLine (tt[i]); } Two, but for (;;) What does it actually mean?Meaning: For parentheses, the content before the first semicolon is executed before the first loop, and the contents before the second semicolon are judged before each execution (if the

The official explanation for View.getrootview () is: Finds the topmost view in the current view hierarchy. find the top-most view in the current view hierarchyMy understanding is to find the root view of the view hierarchy where the view instance resides.To confirm the true meaning of this view.getrootview (), I tested the following:Activity_main.xml:Test_layout.xml:Mainactivity.java:public class Mainactivity extends Activity {@Overrideprotected void

){ $this->success ("Modified successfully", "Zhuyemian"); }Else{ $this->error ("Modification failed!! "); } //Note: Two Jump methods success and error, used for page jump hints, and can support Ajax submissions. } } Public functionShanchu ($code){ $n= D ("Nation"); $r=$n->delete ($code);//Delete () method executes the deletion of the specified data if($r){ $url= U ("Zhuyemian");//Use the U-shortcut metho

From the web to an analysis of Apple WWDC behind an article, the author of the article for Apple this year, "No bright spot" of the WWDC conference made a summary, from the developer's perspective, from the overall Apple strategic perspective of the Apple WWDC the meaning of the Conference, the author's view is not necessarily correct, But some of these ideas are thought-provoking. (At least, I think a lot of small soup) ...So here, the soup to the or

Goto: meta name meaning: What is META? Meta is actually an auxiliary tag in the head area of the HTML language. In almost all of the pages, we can see similar to the following HTML code: Some people say, this code seems dispensable, not much practical effect! It's not useless, but you're not using the META tag well. Why do you say that? This is because the META tag has a number of parameters, using different parameters to enable the home page to imple

curlcurl_setopt-setting session parameters for a curlcurl_version-getting the version information about Curlcurl_close-closing a Curl sessionDuring the curl crawl, a http_code is returned, and the following is their meaning information$http _code["0"]= "unable to access";$http _code[""]= "Continue";$http _code["101"]= "Switching Protocols";$http _code["]=" "OK";$http _code["201"]= "Created";$http _code["202"]= "Accepted";$http _code["203"]= "non-auth

It is believed that before HTML5, few people would care about the definition and application of the tag element in the head of the HTML page, and probably remember that only "title", "keyword" and "description" were used to understand the new standard of HTML. In particular, the development of mobile pages, you can see this piece of HTML is becoming more and more important for everyone to know, the first time to see these tags are basically confusing the mind, today to comb the definition of the

providing specific values. For example:Android:textcolor= "? Android:textdisabledcolor"Note that this is very similar to resource references, except that we use a "?" Prefix instead of "@". When you use this tag, you provide the name of the property resource, which will be looked up in the subject, so you do not need to display the declaration of that type (if the declaration is in the form of Android:attr/android:textdisabledcolor). In addition to using the identifier of this resource to query

providing specific values. For example:Android:textcolor= "? Android:textdisabledcolor"Note that this is very similar to resource references, except that we use a "?" Prefix instead of "@". When you use this tag, you provide the name of the property resource, which will be looked up in the subject, so you do not need to display the declaration of that type (if the declaration is in the form of Android:attr/android:textdisabledcolor). In addition to using the identifier of this resource to query

The margin tag can take one, two, three, and four parameters, each with a different meaning. margin:20px (upper, lower, left and right 20px.) ) margin:20px 40px; (upper, Lower 20px; left and right 40px.) ) margin:20px 40px 60px; (top 20px; left and right 40px; lower 60px.) ) margin:20px 40px 60px 80px; (upper 20px; right 40px; lower 60px; left 80px.) ）Using margin in CSS allows you to margin-top,margin-right,margin-bottom,margin-left, abbreviated to a

The fine meaning of programming--On the reading of "Boulevard to Jane"As a programmer, the first is the existence of human beings, followed by writing programs.As a person, the most important thing is his mind. The French philosopher Pascal, in the wind of the reed in thinking, said: "The thought of the formation of human greatness." A man is but one of the most vulnerable reeds in nature, but he is a thinking reed. "Thinking makes people different in