es5 javascript tutorial

JS Getting Started Tutorial: JavaScript Try ... Catch Error Capture Instance tutorial One of the try ... catch declarations allows you to test the error of a block of code. ExampleOne of the try ... catch declarationsHow to compose a try ... catch statement. The confirmation box for the try ... catch declarationAnother example is how to write a try ... cat

This article is the official HTML5 training course for Brother Lian it education organization, mainly introduces: JavaScript intensive tutorial--javascript Math (Arithmetic) objectThe Math object works by performing common arithmetic tasks.Round ()How to use round ().Random ()How do I use random () to return a random number between 0 and 1.Max ()How to use Max ()

This article mainly introduces the relevant information of the JavaScript Object-Oriented Programming Tutorial. If you need it, you can refer to the definition of objects in JavaScript as a set of unordered attributes, its Attributes can contain basic values, objects, or functions. You can think of an object as a hash, that is, a group of key: value pairs. The va

This article mainly introduces the javascript prototype chain and inheritance related information. If you need it, you can refer to the js prototype chain and inheritance, which is the focus of js, therefore, we will give a detailed explanation through the following three examples. First, define an object obj. The prototype of this object is obj. _ proto _, we can use the getPrototypeOf method in ES5 to q

Basic javascript tutorial Arithmetic Operators Operator Operator description Example Example + Addition X + y If x is an integer of 2, y is an integer of 5, x + y is equal to 7If x is the string "text1" and y is the string "fun ",X + y equals to "text1fun" - Subtraction X-y * Multiplication X * y / Division X/y

JavaScript: About the collection and efficiency in JavaScript, Javascript tutorial An array is an internal object provided by JavaScript. It is a standard set. We can add (push), delete (shift) elements, we can also traverse the elements in the for loop, so can we have other

Javascript: Javascript calls XML to create a linkage drop-down box. Javascript tutorial The traditional HTML page uses two methods:1) directly store the content in the drop-down box in html javascript, and call the javascript func

JavaScript: The JavaScript reflection mechanism of AJAX. What is the reflection mechanism in the Javascript tutorial? The reflection mechanism means that the program can obtain its own information at runtime. For example, an object can know its methods and attributes at runtime. Use (... In ...) Statement reflection

always at the end of the scope chain. 3. Nested object members can significantly affect performance and are used sparingly. 4. The deeper the property or method is in the prototype chain, the slower the access speed. 5. In general, you can promote JavaScript performance by storing array elements, object members, and cross-domain variables in local variables, because accessing local variables is faster6. Use with as little as possible, because he will

Javascript: The nbsp; javascript nbsp; processing in the search engine PAGE analysis. When creating a search engine or performing PAGE analysis and data extraction, the Javascript tutorial, there are often many javascript in pages, and a considerable part of the page conte

With the rapid development of the Internet, the earth has become smaller, people can cross the boundaries of time and space to communicate in cooperation. But then there are some vandalism hackers, which makes it possible for program designers to think about hacking in their applications, so it's natural to think of protection. This tutorial will teach you how to use JavaScript for password protection. Ther

This article describes how to create a JavaScript framework, including DOM and debugging of various attributes! If you need them, can you refer to them and find them incredible? Want to know how Dojo is implemented? Curious about JQuery's skills? In this tutorial, we will explore the secrets behind the framework and try to build a simple version of your favorite framework. We use various

This article describes how to create a JavaScript framework, including DOM and debugging of various attributes! If you need them, can you refer to them and find them incredible? Want to know how Dojo is implemented? Curious about JQuery's skills? In this tutorial, we will explore the secrets behind the framework and try to build a simple version of your favorite framework. We use various

JAVAScript: Page self-adaptation through JAVAScript. Javascript tutorial Sometimes, we may need to make some data display blocks adaptive according to the page size like the new Yahoo Mail. The fact is not difficult, but if we simply use CSS control, we often cannot fully implement the results we need. At this time, we

Javascript: Example: Try to write friendly Javascript code, Javascript tutorial In the Search Engine's robot Search, the "text" such as type, text, and html have the highest degree of friendliness (except for text/xml at present ), the friendliness of text and javascript is

dismiss a reference to object B> b=Null;NullPerform garbage collection again> Global.Gc(); undefined//release B after the reference, heapused change back to around 4M //description weakmap the length of 5*1024*1024 The array was destroyed > process. Memoryusage{rss: 20639744842547239797928956 " In the above code, as long as the external reference disappears, Weakmap internal references are automatically purged by garbage collection. This shows that with its help, it is much easie

Javascript: summary of the javascript pop-up window, Javascript tutorial Author: Luo daijun, ldj_work # 126.com. reposted to ensure integrity.1. No prompt to refresh the webpageHave you found that when refreshing some webpages, a prompt window will pop up and click "OK" to refresh the page.Some pages do not prompt. If

Javascript: Example: using Javascript to create sound buttons, Javascript tutorial Introduction: In general, buttons on a webpage do not trigger sound events. If you want the button to respond to the sound of the mouse action, you can write a JavaScript script code. The scri

JavaScript: Common JavaScript detection scripts. Javascript tutorial * ------------------------------------------------------------------------------- File Name: check. js Note: JavaScript scripts are used to check the input data of the webpage submission form. Version: 1.0

Javascript: use JavaScript to detect browser-related features. Javascript tutorial I. Check the browser nameProblem:Different browsers have different standard support for javascript. Sometimes you want the script to run well on different browsers. In this case, you need to c