JavaScript

Reader_1» reader_2» Reader_3» var arr = new Array ([1,2,3],[4,5,6],[7,8,9,10]); for (Var e in arr) alert (arr[e]); Reader_4» JScript is available with VBArray reader_5» Declare an array first: A=new Arrray (First_num); Again is: A[first_num]=new

First, let's introduce event bubbling and event capture. The processing mechanism for events in the browser defaults to event bubbling, for example #div1 { width:500px;height:500px; Background:rgb (12,42,31); } #div2

If you compare programming languages to women, then JavaScript is ... If you compare a programming language to a woman, PHP is your bloom sweetheart, but don't try to pursue it because she has a serious illness. And Perl is the sister of PHP, you

1. Intelligent Contract Srp.sol Content Contract Simplestorage { uint Storeddata; function set (UINT x) { storeddata = x; } function get () constant returns (UINT RetVal) {return storeddata; } } 2. Compile the

Evaluates a expression after a specified number of milliseconds has elapsed. (executes the specified expression after the specified time) Syntax:itimerid = Window.settimeout (Vcode, Imilliseconds [, Slanguage]) Parameters Vcode

has not been able to adhere to the habit of blogging, after n months once again write a blog, is also the first technical blog, the example project is two or three months ago in the school wrote, writing is also relatively simple, the first contact

Since JavaScript is OOP programming, there must be a concept of inheritance. Internet search a bit, more chaotic, here I do a summary. There are roughly three ways: 1, Apply/call, can not inherit the prototype; 2, prototype, the parent

The Eval function receives an argument s, and if S is not a string, it returns directly to S. Otherwise execute the S statement. Such as If the result is a value, it returns this value, otherwise returns undefined. It is necessary to note that the

The splice () method of array arrays is also a very powerful way to delete, insert, replace It should be noted that the splice () method modifies the original array directly I. The use of deletion Grammar: Array.splice (starti,n); Starti refers to

In JavaScript, the Replace function acts as a string substitution function, which is a powerful string manipulation function for recommended use of common string operations. This essay will come to a deeper understanding of it. The Replace function

Where do the 1.this keywords appear?This he can only appear in the function. Of course, in the global scope is an exception, meaning this can only occur in two contexts, one in the function body, and the other in the global scope.What is 2.this?This

What is the prototype chain??? The concept of C/c++/java class has been deep in my heart, and suddenly this is not suitable. What's the use?And see the back ES6 grammar, unexpectedly also joined the class?????What the hell? Isn't that a hit on your

Introduction: Learning the object-oriented language (Java, C + +) of children's shoes are aware of the concept of object-oriented, and certainly know the characteristics of object-oriented language: encapsulation, inheritance and polymorphism, but

function declarationfunction declaration Promotionfunction expressionanonymous function/lambda function1 recursion2 closures (functions that have access to variables in another function scope)2.1 Closures and variablesA closure can only get the last

Integration testing of JS using Capybara Talk about Drive Let the test pass Webpack in Development Mode JS design is an important factor for users to have a good experience on the web. However, many Web pages do not test JS.This is

All array instance objects of JavaScript, in addition to adding or removing attributes, inherit properties (methods) from Array.prototype. Modifying the prototype of an array affects all array instances.Properties of an array

There are also reference types in JavaScript, as in Java.JavaScript is also commonly used for reference types that are familiar with object and array.An object and an array, which is the most used in both the front and back-end separation

Download the official demo,4.7, ran in the terminal, the test was successful (not packaged)In the test to reduce the unnecessary files, using the HTTP protocol run (the file protocol is not OK)The simplest directory is as follows:I put the above

The content of this article: Variables for JavaScript Data types for JavaScript The JavaScript operator The process structure of JavaScript Starting Date: 2018-05-09 Variables for JavaScriptTo create a variable:Global

Introduction to JavaScriptJavaScript is a dynamic, weakly-typed, interpreted programming language that enhances page dynamics and enables real-time dynamic interaction between pages and users.JavaScript is made up of three parts: ECMAScript, DOM,