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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: site search script Example 1 (javascript), Javascript tutorial Script description:Step 1: Add the following code to the region

Javascript: site search script Example 3 (javascript), Javascript tutorial Script description:Step 1: Add the following codeRegion

Javascript: site search script Example 6 (javascript), Javascript tutorial Script description:Step 1: Add the following codeRegion

JavaScript: Flash and JavaScript Information Interaction, Javascript tutorial I have provided too little information on the Internet. I have studied it for a day or two and provided an example for your reference! Interaction between Flash and 3D information

Javascript: javascript enables word-based tag-based word search. Javascript tutorial The complete sample code is as follows: The following is a reference clip: Untitled Document document.body.onload=adddiv; document.onmousedown=recordobj; document.ondblcl

JavaScript: javaScript objects and attributes, Javascript tutorial 1. Create an empty object: var o = new object ();2. Quantity of directly created objects:Var cricle = {x: 0, y: 0, radius: 2}Var homer = {Name: "Homer Simpson ",Age: 34,Married: true,Email: zzy@163.com"}3. Set and query attributesVar book = new object (

JavaScript: javascript scope, Javascript tutorial

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

Detailed description of argument in the basic Javascript tutorial, basic tutorial argument Argument is a special parameter of a function in javascript. For example,Use argument to access function parameters and determine whether the function is executed Copy codeThe Code is as follows: The length attribute of argument

This article mainly introduces the JavaScript plug-in development tutorial, which is very detailed, I. opening analysis Hi everyone! Today, this series of articles mainly talk about how to develop plug-in-type development based on "JavaScript". I think many people are familiar with the word "plug-in, Some people may be called "components" or "components". This i

Javascript: select all the checkbox columns of the datagrid client, invert selection, Javascript tutorial Simplest format: This is a clever method, but it is not universal. The premise is that this page has only one datagrid and only the datagrid has a checkbox. This is more convenient. The main idea is to search for the checkbox of the entire page and select all