JavaScript

JS inheritance is used to do what:JS does not really like other object-oriented language as the concept of inheritance, JS inside the said inheritance refers to the simulation of inheritance.Specific JS inheritance is what to do, just start to do

Promise Core DescriptionAlthough promise has its own specifications, but the current various types of promise libraries, in the promise implementation of the details are different, and some of the API even in the sense of a completely distinct. But

The Boolean value true represents True and false for false. The generic relational operator returns the result of a Boolean value. In addition, values of 0,-0, NULL, NaN, undefined, and null characters ("") of special values are interpreted as false,

First of all, a question: As shown in figure: Suppose the growth rate is shown as follows: Growth rate of 5 shows 1 arrows; Growth rate of 10 shows 2 arrows; Growth rate of 12 shows 3 arrows; Growth rate of 15 shows 4

SVG can often be used as a cross resolution video. This means that the sharpness of the picture will not be lowered on a high score screen. In addition, you can even get SVG to move by using some JavaScript class libraries. Next, we'll share some

What is cross-domain JavaScript is not allowed to call objects on other pages across domains for security reasons. But it also brings a lot of trouble to injecting IFRAME or AJAX applications at the same time as security restrictions. Here's a quick

In JavaScript we need to use a lot of trim, but JavaScript has no independent trim function or method to use, so we need to write a trim function to achieve our goal. programme I: A prototype invocation, Obj.trim (), is simple and widely used, and

Example The code is as follows Copy Code var tel = 18767802354;var reg =/^0?1[3|4|5|8][0-9]\d{8}$/;if (Reg.test (tel)) {Alert ("Correct number ~");}else{Alert ("Wrong number ~");}; Match the phone number at the

Now in conjunction with an article on the Web, review the scope of this thing. Scopes and contexts are not the same thing, and many people may confuse it. Each function call is associated with a scope and a context. Fundamentally, scopes are based

The definition of JS array: The code is as follows Copy Code Method 1.var mycars=new Array ()mycars[0]= "Saab"mycars[1]= "Volvo"mycars[2]= "BMW"Method 2.Define and initialize together:var mycars=new Array ("Saab", "Volvo"

Let's look at a jquery drag-and-drop effect, as long as the monitoring MouseDown and MouseMove MouseUp is OK, see the example below The code is as follows Copy Code Drag Tests if invalid, please refresh the next page.

Look at the code The code is as follows Copy Code js practicesimple HTML pagethis is a very simple HTML page.it ' s about as basic as they come. It has: an H1 tagtwo paragraphsan unordered list Only in Google

Say nothing more, directly on the code, see the original author comments go, uh ...Static private variables The code is as follows Copy Code var mynamespace = {}; Defining namespaces Mynamespace.treeitem = (function () {

The code is as follows Copy Code var myclass= (function (name) {var target={Name:name,Init:function (age) {This.age=age;}};Target.init.prototype=target;target.init.position= ' POSITION ';var myclass=target.init;return MyClass;}) ('

Web effects load XML document functions I checked the JavaScript Authority guide, looked at some of the writing on the web, and then sorted out a loaded XML function that was in principle fully compatible. After my test are: ie6/7/8,ff (geckos),

Common Web page Effects form verification Regular (phone, mailbox, number, illegal character) function $ (obj) { return document.getElementById (obj); } function Test_phone (strphone) { var Myreg =/(^ (0d{2,3})-(D{8}) $) | (^ (0d{3})-(D{7}) $

1. When the number of actual parameters does not match the number of formal parameters, no error is caused.If the actual parameter value is too high, the parameter value that is exceeded is ignored, and if the actual parameter value is too small,

JavaScript Try catch is used in JS to catch errors, let's look at the examples and tutorials for Try catch. One of the try ... catch declarations allows you to test the error of a block of code.ExampleOne of the try ... catch declarationsHow to

Most of the methods defined by document are production methods, primarily used to create various types of nodes that can be inserted into a document. The common Document methods are: Method Describe CreateAttribute ()