JavaScript

Objects and arrays are mutable types; The string is immutable: You can access text anywhere in the string, but JavaScript does not provide a way to modify the text content of the string.JavaScript variables are untyped (untyped), variables can be

Before you learn JavaScript, make sure you have the HTML, CSS basics.What can JavaScript do?1. Dynamically change the content of the page (typical angular)2. Change the appearance of the Web page dynamically by modifying the CSS style3. Verifying

document Element (ID) for 1.Window object PropertiesIf an id attribute is used in an HTML document to name an element, and if the Window object does not have a property of that name, the window object is given a property whose name is the value of

There are three functions in JS that can convert non-numeric types to numeric types: number (), parseint (), parsefloat (). the first function, the transformation function number () , can be used for any data type, while the other two functions

One, JavaScript scope1 scope (global scope)Objects that can be accessed anywhere in the code have global scope, typically with global scope in the following situations:(1) The outermost function and the variables defined outside the outermost

First, the Language foundation        1.javascript, only null and undefined are values that cannot have methods, and they do not have wrapped objects. typeof null = = ' object ', typeof undefined = = ' undefined '         2. In JavaScript operations,

Math Object Properties Pi π E-Readme Constants LN2 returns the natural logarithm of 2 LN10 returns the natural logarithm of 10 LOG2E returns the logarithm of base E with 2 LOG10E returns the logarithm of base E with 10

1 //look at a piece of code first2 varA = 100;3 functionTest () {4 alert (a);5 varA = 200;6 }7 8 test ();9 /*Ten results: undifined One cause: The JS engine scans the script code block as it executes it. A declare all variables first, so when

JS + CSS implement vertical navigation menus with different prompts and vertical navigation menus This article describes how JS + CSS implements vertical navigation menus with alternative prompts. Share it with you for your reference. The details

Solution: if the child element is set to margin-top and the parent element is also affected, margin-top is affected. set the child element to margin-top, and the parent element is also affected

JS implements the navigation menu code with an arc background gradient effect, and the arc navigation menu This example describes the navigation menu code for JS to achieve gradient effect with an arc background. Share it with you for your reference.

Mask reflection gradient, reflection gradient1. Background radial gradient: Background:-webkit-radial-gradient (30% 30%, # fff 0%, #000 100% );2. linear gradient of background: Background:-webkit-linear-gradient (top, #000 0%, # ccc 30%, # ddd 35%, #

Details about JavaScript scopes and closuresJavaScript is a widely used language. It also has some characteristics and advantages. This article focuses on its scope mechanism and closure, and will discuss its mechanism from some examples. The scope

JQuery drag layout Save the result to the database, jquery drag The recent project involves the user's need to customize the Home Page. Users require that you can drag the Home Page module to achieve personalized layout. This article explains how to

Implementation Method of jQuery + HTML5 beautiful waterfall stream layout, jqueryhtml5 This article describes how to implement the stream layout of jQuery + HTML5 beauty falls. Share it with you for your reference. The details are as follows: This

Jquery param ()The jQuery. param () function is used to serialize a JS array or object into a string value. The jquery object is serialized as a URL parameter by name/value or key/value and connected. Used for URL query strings or AJAX requests.

Common font units in CSS: differences between px, em, rem, and %, pxrem When I first came into contact with CSS, px was widely used and well understood. However, after a long time, I found some defects, especially in responsive development. So when

How to Implement CSS hyperlink background switching, css hyperlink background How to Implement CSS hyperlink background switching:Suggestion: writing code as much as possible can effectively improve learning efficiency and depth.A considerable

Javascript + CSS: webpage sliding door menu effect code with automatic switch, css sliding door This article describes the code of webpage sliding door menu effects that JS + CSS achieves automatic switching. Share it with you for your reference.

Code sharing of image carousel effects with thumbnails in js and js thumbnails This article describes the image carousel Effect of js with thumbnails. Share it with you for your reference. The details are as follows:This is a javaScript-based image