pentaho javascript

Javascript: traversing the prototype chain, calling stack, and scope chain In JavaScript, there are three common chain structures: prototype chain, call stack (Call StackScope chain. This article does not want to talk about the basic knowledge of these concepts, but rather shows how to traverse the three chain structures to deepen understanding. Traverse prototype chain In

The script in the HTML must be between the tags.The script can be placed in the JavaScript Functions and EventsThe JavaScript statements in the example above will be executed when the page loads.In general, we need to execute code when an event occurs, such as when a user taps a button.If we put JavaScript code in a function, we can call it when the event occurs

Learning javascript object-oriented understanding of javascript prototype and prototype chain, javascript object-oriented Let's take a look at a picture and sort it out. I. Basic Concepts　Prototype chain]Each constructor has an object. The prototype object contains a pointer to the constructor, And the instance contains an internal pointer to the prototype objec

Javascript basics and javascript beginners are recommended in javascript beginners. Some time ago, when I read the javascript advanced tutorial, I found many basic javascript concepts that I don't understand. I searched the internet and saw that 《Basic

Traditionally, Javascript files are loaded using the script tag. We can also use the DOM method to dynamically load Javascript files. The specific implementation is as follows. If you are interested, refer to the traditional method, the script label is used to load Javascript files. As shown below:

The javascript design pattern is turing Publishing. in learning, I want to focus on every chapter. Question: 1.1 javascript flexibility Object-oriented Javascript programming mode: 1. Saving state 2. methods that can be called within an object 3. Better understanding of the structure of a program, able to withstand iterative development (in my opinion) The Co

Document directory Attribute Method 1. Create an instance of the object 2. Create an object Template Objects help organize information.Instance Instance of the created object This example shows how to create an instance of the javacripobject ). Create an object Template This example shows you how to create a template for a javacript object ). JavaScript Object In the previous section of this tutorial, we have learn

Javascript (1) Summary of javascript Array usage (2), javascript Array // 1. array sorting. The default value is ascending. The sort () method calls the toString () of each item in the array, and then compares the obtained string to sort the result. // sort (): returns the sorted array // var arr = [23,1, 3,56, 42,-1]; // arr. sort (); // alert (arr); //-, // eve

Javascript is a sequence of statements executed by the browser. Javascript statements The javascript statement is a command sent to the browser. These commands are used to tell the browser what to do. This JavaScript statement tells the browser to output "Hello World" to the webpage ": Document. Write ("Hello W

Comparison of the Javascript efficiency of various Javascript browsers it is reported from an article on "translated words" that the comparison of Javascript in various browsers. As a Javascript developer, I personally pay more attention to this matter. I still trust SunSpider in the test area, as the original article

Javascript learning diary-prevents javascript events from bubbling and obtains the Control ID value 1. How to Prevent event bubbles The Code is as follows: // Non-IEIf (event event. stopPropagation)Event. stopPropagation ();Else // IEWindow. event. cancelBubble = true; 2. Get the Control ID The Code is as follows: If (document. all ){// IEAlert (event. srcElement. tagName + ":" + event. srcEl

How many seconds does function sleep in js? Javascript beginners often ask this question. Since the emergence of Javascript, this function is so necessary, but why does js not provide such a function? Currently, all browsers parse js in the UI thread. Taking Firefox as an example, I re-compiled the js engine and added the sleep method to the js alert. This method calls the C language thread sleep functio

This article mainly introduces a simple example of implementing the TAB switch Effect of js (JavaScript). If you need it, you can refer to it and hope to help you with JavaScript) the tab Label Switching code of, can automatically adapt to the width, you can add and delete the label block yourself, you can complete the silly operation! The Code is as follows: 19991224/loose. dtd "> Adaptive width labe

Document directory Instance 1 Instance 2 Syntax: Instance Syntax: Instance: The Condition Statement in Javascript is used to complete the action under different conditions.Instance If statement How to compile an if statement. If... else statement How to compile the IF... else statement. If. Else if... else statement How to compile the IF... else if... else statement Random Link This exam

This article mainly introduces how to increase the loading speed of javascript. write output js solves the problem of slow ad loading speed. If you need it, you can refer to it. Generally, some js Code will be loaded on our website, such as statistics, google ads, Baidu alliance, alimama advertising code, The page loading speed was slow and slow. Solution: Use a js inclusion method to increase the loading speed of

When JavaScript is used on pages, where should these JS code be placed? Next, let's learn how to use JavaScript on the page. where should these JS code be put? Let's take a look. Generally, there are two ways to write on the interface and use. js files. 1.1 Head part on the interface You can directly put it in the head label, as shown in the following code: TestPage