learn javascript for unity

Closures, is an important concept in JavaScript, for beginners, closures are a particularly abstract concept, especially the ECMA specification to the definition, if there is no actual combat experience, you can not understand it from the definition. Therefore, this article does not have a large description of the concept of closures, directly on the dry goods, let you learn to close the pack minutes!1 Clos

Original: Learn JavaScript from the beginning (c)--data typeFirst, classificationBasic data type: Undefined, null, string, Boolean, numberComplex data type: ObjectThe properties of object are defined in the form of unordered name and value pairs (name:value)Second, detailed1, undefined:undefined type has only one value: Undefined, when using VAR to declare a variable but uninitialized, the value of this var

Original: Learn JavaScript from the beginning (ii)--variables and their scopesOne, variableECMAScript variables are loose variables, so-called loose variables, that is, variable names can hold any type of data, each variable is just a placeholder for holding the value.Definition: var Firstdemo;Ii. Scope of variables2.1 Basic ConceptsUse Var to define a variable: A local variable that defines the scope of th

("Start synchronizing file, ID:" + ID); var Proxysynchonousfile = (function () { var cache = [], ///Save the ID timer that needs to sync the file this time ; Timer return function (ID) { cache.push (ID); if (timer) { //does not overwrite a timed return that has started ; } Timer = settimeout (function () { synchronousfile (Cache.join (",")); Cleartimeout (timer); timer = null; cache.length = 0; Empty Cache }, Watts); }

conditional value update) { if (special case) {break;} Loop Code } Test results output, if the results continue to output the next grade, if the results are not passed, exit and do not output after the result. 9. Continue circulation continue Statement structure: for (initial condition; criteria; after cyclic condition value update) { if (special case) { continue } Loop Code } In the above loop, when special circumstances occur, this

this: var a = 1; var B = true; Console.log (A = = B);//true Aren't they equal? In fact, this is the knowledge of type conversions and = = operators, which means that some type conversions occur when you compare two variables of different types with = =. A comparison like the one above will convert true to number 1 and the number 1, and the result is true. This is when the two values of the comparison of different types of the = = operator will be type conversion, but when the sam

/Syntax Description Capture (exp) Match exp, and capture text into an automatically named group (? Match exp and capture the text into a group named name, or you can write a (? ' Name ' exp ') (?: EXP) Matches exp, does not capture matching text, and does not assign group numbers to this group 0 Wide Assertion (? =exp) Match the position of the exp front (? Match the position of the exp back

using closures1) Because the closure will make the variables in the function are stored in memory, memory consumption is very large, so can not abuse closures, otherwise it will cause the performance of the Web page, in IE may cause memory leaks. The workaround is to delete all the local variables that are not used before exiting the function.2) The closure changes the value of the inner variable of the parent function outside the parent function. So, if you use the parent function as an object

. Therefore, we should pay attention to the scope of variables in the use of the packet function.*/function Calllocalvar () {var sayalertname = function () {alert (name)};var name = "Jacy";return sayalertname;}Calllocalvar () ();//Such a write will first run Calllocalvar and then run the returned Sayalertname;/*NoteSummary closure functions are able to access variables defined by the same domain, whether in front of or behind the closure function. Only if the same domain can be interviewed.*/fun

One, function callfunction is definitely the most important in JavaScript. In JavaScript, function assumes the functions of procedures, methods, constructors, and even classes and modules. In object-oriented programming, Functions,methods and class constructor are often three different things that are implemented by different grammars. But in JavaScript, these t

; This.color = color; } Cat.prototype.type = "cat family animal"; Cat.prototype.eat = function () {alert ("Eat Mouse")}; Then, the instance is generated. var cat1 = new Cat ("hairy", "yellow"); var cat2 = new Cat ("Er Mao", "Black"); alert (Cat1.type); Cat Cat1.eat ()//eating mice The type attribute and the Eat () method of all instances are in fact the same memory address, pointing to the prototype object, thus increasing the efficiency of the operation. Alert (cat1.

main 2 optimization: (1) Generational recycling (Generation GC) This is consistent with the idea of Java recycling strategy. The goal is to reduce the time consuming per GC by distinguishing between "temporary" and "persistent" objects, by recycling the "temporary objects" area (young Generation), by recycling less the persistent objects area (tenured generation), and by reducing the number of objects that need to be traversed each time. As shown in figure: Here's what you need to add: for

Every day, Bootstrap must learn the navigation bar. This article explains a variety of navigation bars and how to implement the elements in the navigation bar. If you are interested, refer 1. navigation bar The navigation bar (navbar) differs from the navigation bar (nav) introduced in the previous section by a single word, with an additional "entry. In fact, they are quite different in the Bootstrap framework. There is a background color (more promi

Every day, Bootstrap must learn the front-end development framework. Today, this article will show you how to understand the most popular front-end development framework Bootstrap. What are the reasons why bootstrap is very popular, let's take a look. From now on, the front-end development framework BootStrap can greatly simplify the website development process, which is favored by developers. This article summarizes the 11 main reasons why Bootstrap

To engage in web development. I don't know where to begin.The JavaScript language does not know how to step in.The best way is to constantly do Web pages, write code. Constantly look at other people's Code, study other people's Code!Practice JS with code every skill point: listen to more read more ask more write!Learn to System, can also find a super-useful XXX code snippet, meticulous grinding!Keep track o

Original: Learn JavaScript from the beginning (v)--operator (ii)One, multiplicative sex operator1. Multiplication: *Some special rules for multiplication operators: If the operand is a numeric value, it is calculated by normal multiplication, and if the product exceeds the representation range of the ECMAScript value, it returns infinity or-infinity If one of the operands is Nan, the return res

To learn basic web Front-end development technologies, you must master: HTML, CSS, JavaScript language, and cssjavascript. 1.HTML is the carrier of webpage content. The content is the information that the Web Builder places on the page and allows users to browse, including text, images, and videos. 2.CSS style is a manifestation. It is like a webpage coat. For example, the title Font, color change, or add

precedence when you see an expressionDomain is the first and next, is single-threaded, processing one after another to the next, like the introduction of libraries;function is also a domain, just a local domain;The pre-parsing steps are performed;If there is a variable inside, it takes precedence over the variable, and the local variable takes precedenceThe child scope is scoped to the parent scope, which is the scope chainParsing process1) Pre-parsing2) Read the Code by line:An expressionFunct

Original: Learn JavaScript from the beginning (ix)--Execution environment and scopeThe execution environment: Defines the other data that variables or functions have access to, and determines their respective behavior. Each execution environment has a variable object associated with it.Variable object: Holds variables and functions defined in the environment.Scope chain: Ensures an orderly access to all var

1. First look at W3school, understand what is JS, and then find a few books to write JS small effect of the book to see, Know what JS do;2. Then go through the API, recommend the "JavaScript authoritative guide", fourth edition, the sixth version of a lot of things do not need to be in contact with the time to understand, too deep;3. The end is "JavaScript design mode", read the excellent framework source;4