ecmascript tutorial

1. ECMAScript does not have a block-level scope, so variables defined inside the loop are also accessible outside the loopegvar count = 10;FPR (var i=0; ialert (i);}alert (i); 102. The function of ECMAScript can define any parameter, and the two parameters can not correspond to any parameter.The arguments passed in when the function is called are stored in arguments[], and the parameters that are written wh

In the past few days, I spent some time reading ecmascript. The following are some of my summary. Under this record. Part 1: understanding of variable objects 1) What is a variable object? Data access and reading mechanisms are variable objects. Variable objects are execution context-related objects, including: Variable (VAR) Function Definition (FD) Function Parameters 2) about function arguments Function Foo (x, y, z ){Z = 4

2.8 reference type 1. Object Class All classes in ECMAScript are inherited by the Object class. The Object class has the following attributes: Constructor: A Reference (pointer) to the function that creates an Object. For an Object class, this pointer points to the original Object () function. Prototype: Reference to the object Prototype of the object. There are several methods for the Object class: HasOwnProperty (property): determines whether an ob

Use the ecmascript object model to compileCodePreviously, we certainly wanted our coding process to be as easy as possible, so here let's look at how to implement the smart prompting function when writing code.1. Create a Javascript file in vs2010. 2. Add the following code at the beginning of the file: ///ReferenceName= "Microsoftajax. js"/> We must. javascript references are placed on the first line. Javascript has a certain degree of atten

--- Restore content start --- Ecmascript has five primitive types: undefined, null, Boolean, number, and string. 1. typeof Operator The typeof operator has a parameter, that is, the variable or value to be checked. For example: VaR EMP = "Hello World "; Alert (typeof EMP); // output "string" Alert (typeof 100); // output "Number" ---- If the variable is of the undefined type, undefined is returned; ---- If the variable is of the boolean type, the retu

To get a better insight into how JavaScript works, you must first understand the core ECMAScript of JavaScript. ECMAScript variables can be divided into original values and reference values Original type: Undefined,number,string,boolean,null. Determining the type of a variable using the typeof operator may return "undefined", "Boolean", "string", "number", "Object", "function" The following is a referen

Ecmascript objects are mainly divided into two categories:: 1. Local objects, that is, objects independent of the host environment. Object fuction array string Boolean number date RegEx error evalerror rangeerror referenceerror typeerror urlerror syntaxerror A special type of local object is built-in objects: Global and math. Ecmascript does not exist in independent functions. All function pai

Here, we will summarize the common cases of using the ecmascript object model to operate on goup and user. Because there are many contents, we split them into two parts. The main content of this part is as follows:1. Obtain all groups of the current SharePoint website2. Obtain the title and Group of the current logon user.3. Obtain all users in a specified group.4. Obtain the specific information of all users in a specified group.5. Obtain the specifi

Ecmascript cruncher developed by Thomas loo (ESC can be downloaded at http://www.saltstorm.net/depo/esc/or 51ajax.com ). ESC is a small window shell script. Ecmascript cruncher developed by Thomas loo (ESC can be downloaded ). ESC is a small window shell script. To run ESC, you must use Windows. Open a console window and enter the following command:Cscript Esc. WSF-L [0-4]-Ow outputfile. js inputfile. js

Here, we will summarize the common cases of using the ecmascript object model to operate on goup and user. Because there are many contents, we split them into two parts. The main content of this part is as follows:1. Obtain all groups of the current SharePoint website2. Obtain the title and Group of the current logon user.3. Obtain all users in a specified group.4. Obtain the specific information of all users in a specified group.5. Obtain the specifi

ES6 (ECMAScript 2015) coding specifications and detailed attention points, combined with a large number of GF securities ES6 practice projects organized,Already open from GitHub, continuous update, welcome PR and issue.GitHub Address: https://github.com/gf-web/es6-coding-style/This specification is based on the JavaScript specification and is only intended for ES6 related contentRefer to the JavaScript specification if the variable is named and if a s

ECMAScript reserved wordsECMA-262 defines a set of reserved words (reserved word) that ECMAScript supports.Reserved words are words that are reserved for future keywords in some sense. Therefore, reserved words cannot be used as variable names or function names.The complete list of reserved words in ECMA-262 Third edition is as follows:Abstractbooleanbytecharclassconstdebuggerdoubleenumexportextendsfinalflo

thread object A importscripts () method enables web worker to load external JS files All the ECMAScript objects XMLHttpRequest Constructors SetTimeout () and SetInterval () methods Here is a importscript method, which is loaded with the blocking method JS, only after all the files are loaded, the next script can continue to runIn fact,WEB workers are suitable for long-running scripts that are purely data-or that are not related t

The uull type in ecmascript, which has a special value of null, that is, its literal volume. The undefined value is actually derived from null, so ecmascript defines them as equal. Alert (null = undefined ); The running result is true. Although these two values are equal, their meanings are different. Undefined is the value that is known for a variable but not assigned to it during initialization.

Ecmascript does not have block-level scopeContent in the comment: First pop up nine "cycle pop-up box" + 1 ~ 9. The "pop-up box outside the loop" + 10 is displayed.Content Without comments: "Out-of-cycle" + 10 is displayed;Ecmascript does not have block-level scope

2.9.5. Addition OperatorsAddition operators (plus signs and minus signs) are usually the simplest operators. However, in ECMAScript, each addition operator has many special behaviors.1. Addition operators:Copy codeThe Code is as follows:Var iResult = 1 + 2;Console. log (iResult); // outputs 3 Special features:The number of operations is NaN and the result is NaN.Infinity and Infinity. The result is Infinity.-Infinity plus-Infinity. The result is-Infin

ECMAScript ArraySelf-summing up the ECMA array bar, the total feeling of learning the mess, what all know, and as if nothing knows!The most basic is the creation of the array, add, delete ... Code Bar1 22 ValueOfCompared to ToString, ValueOf () is still the array, code barAs shown above, the ToString and valueof () methods are called to return as strings, and the string representation of each value is stitched together into a string, separated by com

2.7 Type Conversions 1. Convert to String All objects have a ToString () method that can be converted to a string, note the ToString () method of the number type, which has two modes, the default mode and the base mode, and the default mode ToString () method simply outputs the corresponding 10-digit numeric value with the corresponding string , you can use a base pattern to output numbers in different bases. Example: Copy Code code as follows: var inum1=10; var inum2=10.0; v

Ajax|asp.net|object "Everything is Object" knows this in object-oriented programming languages, but it's a feeling for me, sensed it's hard to say. Because I am on JavaScript and weak, so look at the ASP.net Ajax class library at the same time also turned out ECMAScript by the way learn. All classes in. NET inherit from object, as well as in JS, so that if an object is extended, all descendants of the object class must have ancestry.Now that I'm learn

Brief Introduction Objects are called values of reference types in JavaScript, and there are built-in reference types that can be used to create specific objects that are similar to classes in traditional object-oriented programming, but implement different native reference types 1, object is an underlying type, all other types inherit from Object the basic behavior; 2. The array type is an ordered list of values, while also providing the ability to manipulate and convert these values; 3. The d