empty function

Today, when we use the empty () function to determine whether a variable is null, the following message is displayed: empty () only checks variables as anything else will result in a parse error. in other words, the following will not work: empty

Memory leakage means that a piece of allocated memory can neither be used nor recycled until the browser process ends. In C ++, memory leakage is often caused by manual memory management. Currently, popular languages such as C # and Java use the

Have seen the Yahoo team wrote an article on the performance optimization of the site, the article is about 2010 years written, although a bit old, but many aspects are still very useful reference. As for the performance optimizations of CSS, he

Memory leak refers to a piece of allocated memory can not be used, and can not be recycled, until the end of the browser process, due to the browser garbage collection method has a bug, will create a memory leak, the following with you to discuss in

__proto__ of all constructors/functions point to Function.prototype, which is an empty function 123456789 Number.__proto__ === Function.prototype  // trueBoolean.__proto__ === Function.prototype // trueString.__proto__ ===

* *** @ AuthorsBenjamin (http: blogcsdnnetcuew1987) * (function (win) {reset to an empty function to avoid JS errors reported by varconsolewinconsole |{}, fns [& 039; assert & 039;, & 039; clear & 039 ;, /*** @ Authors Benjamin

Blocked download of external JSWhen downloading JavaScript, all browsers will block all other activities, such as downloading other resources and rendering content. After downloading, parsing, and executing JavaScript code, you can continue to

40 tips to optimize your PHP code The English copyright belongs to Reinhold Weber, the author of Yangyang (aka Davidkoree). The bilingual version may be used for non-commercial communication, provided that the English version of the author,

Android Custom ControlsTo develop a custom control, follow these steps: 1. Understand the working principle of the View. 2. Write a subclass inherited from the View. 3. Add attributes to the custom View class. 4. Draw controls. 5. respond to user

Why do I have a function?Without differentiating the code of all functions together, the question is:Poor code readabilityCode redundancyCode can be extended to poorHow to solve?A function is a tool, the process of preparing a tool beforehand is to

Reprinted from:Http://www.jb51.net/article/84089.htmIn front-end development, it is often necessary to define JS classes. So in JavaScript, there are several ways to define a class, and what are the differences? In this paper, the six-way

Some of the fixed controls and properties may not meet the development requirements during Android app development, so in some special cases we need to customize the controls and properties. First, the implementation of steps1. Inherit the view

To develop a custom control: 1, understand how view works  2, write subclass 3 Inheriting from view, add attribute  4 for custom view class, draw control  5, respond to User message  6, customize callback function     A, view structure principle the

Tappencoder is the encoder project that completes the encoding of the video sequence.At run time, first call the main function in Encmain.cppThe main function is to initialize the Encoder class, parse the CFG file, and then call the

Each specific problem has specific implementation methods, and for the same class of problems, different concrete methods can be abstracted into this kind of method, when given a specific input, this kind of method will become applicable to a

# This is a learning note for the Liaoche teacher Python tutorial1. Defining functionsdefining a function requires a function name, a parameter, and a function body . In the function body, it is better to pass the parameter judgment.1.1. Function

__proto__ of all constructors/functions point to Function.prototype, which is an empty function 123456789 Number.__proto__ === Function.prototype  // trueBoolean.__proto__ === Function.prototype // trueString.__proto__ ===

(1) Succession of Ext.define extendSpecific examples:Ext.onready (function () {//sup class parent ext.define (' person ', {config:{name: ' BJSXT '}, constructor:function (config) {var me = this; Me.initconfig (config);}); /sub class Subclass

1. If a method C++an be static, declare it static. Speed improvement are by a factor of 4. If a method is static, it is statically declared. The rate can be increased to 4 times times.2. Echo is faster than print. echo is faster than print.3. Use

1. If a method C++an be static, declare it static. Speed improvement is by a factor of 4. If a method is static, it can be statically declared. The rate can be raised to 4 times times. 2. Echo is faster than print. echo is faster than print. 3.