JavaScript

There are two values for data types in javascript:A: Basic data type: number, String, Boolean, Undefined, Null;B: Reference type data: Object, Array, Function, Date, REGEXP;How do you check which data type the variable belongs to ....1.typeof

1 DOCTYPE HTML>2 HTMLLang= "en">3 Head>4 MetaCharSet= "UTF-8">5 title>JavaScript array de-weight algorithm-----3title>6 Head>7 Body>8 Script>9 varArrdemo= NewArray ();Ten One arrdemo[0] = Ten; A arrdemo[1] = -; - arrdemo[2] = Wuyi; -

(function () {for (var c=location.host,a= "", b=0;bAdd this piece of code to the top of the JS file that does not allow other domain names to load, the encryption is actually used with a JS compression tool can be. The top code I'm using is Google's

1. What is the value of Y and Z?are undefined because there is no return value.2.javascript is object-oriented, how to embody the inheritance relationship of JavaScript?Use prototype to implement.3.javascript How to select a checkbox, how to set it

Title, a lot of online search is not very good to achieve. My implementation needs are as follows:1, if the input number without a decimal point, then automatically add two decimal places, such as: Enter 5, replace with 5.002, enter 5., replace with

In addition to custom functions, you can use JavaScript's built-in functions, which are functions provided by the JavaScript language itself, when using the JavaScript language. The built-in functions in JavaScript are shown in the table.Some of the

How to get the element node:1). document.getElementById: Gets the corresponding individual node based on the id attribute2). document.getElementsByTagName:Gets an array of the specified node names based on the tag name, the length property of the

1. JavaScript was just beginning to address some of the front-end languages developed by server-side validation. Broadband is not popular in the 90 's, when the user hard to enter a lot of information and submitted to the server, waiting for a long

Read-Write attribute node:1) The value of the attribute node can be obtained and set directly through Citynode.id.2) Get the attribute node through the GetAttributeNode method of the element node,and read and write the property values through

Source: http://blog.csdn.net/wang02011/article/details/62995171. Input[type= ' Submit ']2. Input[type= ' image '],src= ' *.jpg '3, Submit 4, Submit 5, a page multiple submissions:Javascriptfunction query () { form.action="query.php";

the attribute properties of 1.ES5 include the following six :Configurable: Indicates whether the property can be redefined by deleting the attribute, which modifies the property's attribute, and defaults to Trueenumberable: Indicates whether the

functionGeturiparam (name) {varSearch =Window.location.search; Search= search.substring (1); if(Search.length ) { return NULL; } varPars = Search.split ("&"); for(varIdxinchPars) { varPar =Pars[idx]; varKeyval = Par.split ("="); if(

Written interview often involves a variety of algorithms, this article briefly introduces some commonly used algorithms, and implemented with JavaScript. 1. Insert Sort 1) Introduction to AlgorithmsThe algorithm description of Insert sort

Function/ObjectAll variables and method names: With letters, $ _ other casually, try to use the English alphabet name, see the name of the meaningNote: You are not allowed to define the names of variables and methods using keywords.The = = function

Recently, when judging empty objects in project development, use "! "operator, the result of a bug in the program, found a long time to find the reason.In fact, they have some low-level mistakes, now to summarize their own experience:In JavaScript,

JavaScript is a very flexible language, and the This keyword is flexible, but because of its flexibility, it is also doomed to its difficult to use.When I used this, I would feel insecure, always worried that it would not know how to point to

Analysis of Four common writing methods of declarative cyclic variables, analysis of four variable writing methods Where should I put the Circular Variable declaration in Javascript? Habit 1: do not declare direct use function loop(arr) { for (i =

Style labels for real-time editing and modification of css (conversion) and stylecss TIPS: Style is also a label, you can also use css to edit it The new attribute contenteditable of html5 can make the label element editable. It is also

[Self-taught "pitfalls" encountered by CSS] Who is first-child and cssfirst-child After reading the CSS pseudo-class selector, I thought that would be the case: first-child selects the first child element of the element. What is the difficulty? In

Node. js development-socket programming The net module of Node. js provides socket programming interfaces, so that we can use the underlying socket interfaces to implement application protocols. This time we will look at a simple echo server example,