javascript round to 2 decimal

When using js, I often encounter some problems. I used my spare time to sort out some common problem solutions and post them to share with you, if you have any need, refer to section 1. Javascript Chinese and variables are case sensitive. 2. Single quotes and double quotes can be used to create strings without special differences in JavaScript. However, as a gen

JavaScript plugin development tutorial (2): javascript plugin I. Opening Analysis Hi everyone! Remember the previous article ------ the beginning of this series (JavaScript plug-in development tutorial 1 ). This article mainly describes how to develop plug-ins in jQuery mode ", So today we will continue our plug-in dev

This article mainly introduces the implementation of simple level-2 interaction in javascript, which is very practical. If you need it, you can refer to the following level-2 Association, which can be seen everywhere on general webpages. It is generally an address, such as clicking on Zhejiang Province, the city of Hangzhou, Jiaxing city, followed by Chaoyang and

This article mainly introduces the implementation of simple level-2 interaction in javascript, which is very practical. if you need it, you can refer to the following level-2 Association, which can be seen everywhere on general webpages. it is generally an address, such as clicking on Zhejiang province, the city of Hangzhou, Jiaxing city, followed by Chaoyang and

This article mainly introduces the Javascript implementation of image carousel effect (2) related information on the control of image sequence nodes. if you need it, please refer to the following: jquery code for image Carousel (1) In the previous article, we introduced how Javascript achieves Image Carousel (I) to beat the image. here we implement the jump of t

This article mainly introduces the Javascript Implementation of image carousel effect (2) related information on the control of Image Sequence nodes. If you need it, please refer to the following: jquery code for image carousel (1) In the previous article, we introduced how Javascript achieves image carousel (I) to beat the image. Here we implement the jump of t

JavaScript object-oriented (2) and javascriptConstructor and prototype object Constructor is also a function.newA difference between a function called when an object is created and a common function is that the first letter of the function should be capitalized. However, if the constructor is called as a common function (newKeyword), you should note thatthisPoint to the problem. var name = "Pomy";function P

This article mainly introduces javascript code for implementing simple and generous level-2 drop-down menu effects, and involves the dynamic conversion technique of javascript controlling page elements through mouse events, which has some reference value, for more information about how to use JavaScript to implement a

JavaScript variable scope and memory problems (2). javascript Variables Execution environment is a particularly important concept in js. It means that variables or functions can access other data and define their own behaviors. Each execution environment has a corresponding variable object. All variables and functions defined in the execution environment are stor

Common JavaScript code (2): javascript codeThe article is from "PHP100 Chinese network" Obtain the microseconds represented by the timeVar n1 = new Date ("2004-10-10". replace (/-/g, "\/"). getTime ()Close Window?Win. closedCheckbox flatObtain selected contentDocument. selection. createRange (). duplicate (). textAutomatic completionWindow MaximizationNo close

This article mainly introduces how to use DeviceOne for JavaScript development (2) generate the debugging installation package, for more information about how to use DeviceOne for JavaScript development, see the previous article. (1) configuration and start-up, learn together. Generate the debugging installation package It must be noted that this step is not req

1) Get the DOM element ID and CSS attributes Dom is the HTML node. Javascript operates these nodes to achieve website dynamics. The original W3C also provides node access operations, but it is not very useful. Direct access to ID nodes $ ('# Elementid ') 2) Modify CSS attributes The CSS attribute corresponds to a class in HTML. The value of each class must be consistent with a value in the CSS list so that

This article mainly introduces the foldable level-2 menu implemented by JavaScript + CSS, and analyzes the related skills of JavaScript Based on the page element node and style dynamic operations to implement the folding menu in the form of a complete example, for more information, see the examples in this article. We will share this with you for your reference.

This article will review the basic syntax in the ECMAScript specification. Good English friends can directly read the official documentation. JavaScript is essentially a type of C language. If you are familiar with C language, you can easily read this article or even skip it. However, it is recommended that you take a look at it, I may reference some common usage that I think is not easy to understand. Basic syntax 1. identifier: the so-called identi

({css code change}, the time needed for completion, callback );. For details, refer to: Workshop. Of course, animate is obvious, but what about callback ??? It was originally hidden in animate. The Code is as follows: Function () {// use animate in jquery to control the walk of a personActionST ++;If (actionST = 100 ){StandCaocao ();}}); // Call callback when the animation is finished. Functions can be put in callback. This code is callback. But we put his position on the function, so it is

you may know the usage of typeof in Javascript, if you cannot do the following, it means that you do not have enough understanding of typeof. For example:VaR;VaR rs = typeof (a); // What is the RS value?(A) The answer to object (B) variable (c) undefined (d) string (e) null (f) is incorrect.If you select a, you still have some knowledge about Js. If you select B, it is basically a random guess. If you select D, nothing can be said, if you select e, i

This article describes how to implement simple secondary navigation menus in JavaScript and how to design javascript dynamic page elements. it is of great practical value, for more information about how to implement a simple level-2 navigation menu using JavaScript, see the following example. Share it with you for your

Full-stack JavaScript path (20) html 5 insertion html Tag (2) insertAdjacentHTML, full-stack javascript path InsertAdjacentHTML (), which was first introduced in IE, is now included in the html5 specification. It accepts two parameters, one of which is one of the following tags, one is the html code text to be written. Browsers that support the insertAdjacent

Browser has the function of rendering HTML, the HTML source code in memory to form a DOM object, is the document object.Inside the browser there is a JS interpreter/actuator/engine, such as Chrome's V8 engine.In the HTML to write a JS code, JS code is executed by the engine, the result of execution is often the operation of the DOM-common effects (image floating, text discoloration, etc.)The browser is "host", but the host of JS is not limited to the browser, it may be server-side (can be used t

The operators in JavaScript are similar to those in C/C ++, but there are several differences. Compared with C/C ++, several different operators are added, including in, instanceof, typeof, delete. you need to be familiar with it. 2.1 In Operator The in operator requires that the number of operations on the left be a string or can be converted to a string. The number of operations on the right is an object or an array.If the value on the left of t