Two ways to implement the trim () function in JavaScript _javascript techniques

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

JavaScript detects instance properties, prototype properties _javascript tips

0. Premises The properties of a JavaScript object are divided into two existing forms. One is the existence of an instance, the other is the existence of a prototype object. According to the above, there are 4 kinds of cases when detecting

JavaScript converts an array to CSV format _javascript tips

This example describes the way JavaScript converts an array to CSV format. Share to everyone for your reference. The specific analysis is as follows: The valueof method of an array object in JavaScript can output the value of an array as a

JavaScript implementation get Browser version, OS type _javascript tips

The code is very concise, functional very practical, here is not much nonsense, directly to the code: /** * Created by the Administrator on 15-1-12. */function Broswerutil () {} Broswerutil = {//Detect browser version

7 Considerations for making JavaScript a better _javascript tips

As browser performance improves, the volume of JavaScript on the Web page is gradually increasing, along with the steady adoption of the new HTML5 programming interface. However, a poorly written program code has the potential to break the entire

Short-circuit expressions for JavaScript optimization techniques _javascript Tips

What is a short-circuit expression? Short-circuit expression: as "&&" and "| |" Operator's operand expression, when evaluated, as long as the final result can be determined to be true or FALSE, the evaluation process terminates, which is called

Methods for calling functions as parameters in JavaScript _javascript tips

The examples in this article describe the methods that functions in JavaScript invoke as arguments. Share to everyone for your reference. The specific analysis is as follows: First look at the example: function Map () { var obj =

Javascript Writable features Introduction _javascript tips

Talking about the characteristics of JS in the tag, always feel a bit strange, then why to say this attribute, originated from the question of a problem, we all know that the Window object is actually An instance of the browser window, since it is

On the instanceof and typeof_javascript skills in JavaScript

For Instanceof and typeof, formerly used occasionally, especially typeof used more, today, the study of ext source, many places are used to instanceof, suddenly feel that they are similar but also should have their differences, online read some

Introduction to JavaScript _javascript tips

This article is not a reference manual article, only suitable for JS to produce a general understanding, such as the need for the detailed syntax and application of JS, please go to W3school What is JavaScript? The birth of JavaScript Around 1995,

To dwell on the basic attributes of Dom in JavaScript _javascript tips

Structure and Content Properties NodeType All nodes have a type, and there are 12 different types of nodes in total. Copy Code code as follows: Interface Node { NodeType Const unsigned short element_node = 1; Const unsigned short

JavaScript implementation checkbox over limit that is, the pop-up warning box method _javascript tips

The example in this article describes the way the JavaScript implementation check box exceeds the limit, which is the pop-up warning box. Share to everyone for your reference. The implementation methods are as follows: javascript

JavaScript non-parametric and parameter-Class inheritance problem solving method _javascript Tips

When it comes to the class inheritance of JavaScript, the prototype chain is inevitable, but the inheritance through the prototype chain has many defects. Problems with no parameter class inheritance Let's take a look at a sample code to realize B

JavaScript listening and disabling browser carriage return event instance _javascript tips

JS Monitor Browser return event, you can support ie6+, Firefox, Google and other browsers. Copy Code code as follows: So, how do I capture the carriage return event for a specified DOM object? Here take the

A brief analysis of dom_javascript skills in JavaScript

What is DOM? 1. Introduction Document Object model, called DOM, is a standard programming interface recommended by the Consortium for processing extensible flag languages. The history of Document Object model dates back to the "browser wars"

_javascript techniques for functional patterns in JavaScript

The role of JavaScript design patterns is to improve the reusability and readability of your code, making it easier to maintain and extend your code In JavaScript, a function is a class of objects, which means that he can pass as arguments to other

JavaScript settings how to get and set properties _javascript tips

GetAttribute This method is used to get the attributes of an element, which is called as follows: Copy Code code as follows: Object.getattribute (attribute) Unlike some of the methods described earlier, the GetAttribute

JavaScript implements web color value conversion _javascript Tips

have been busy recently to complete the business needs, for a long time did not write a blog. Today for a little while, looking at some of the recent project's front-end code, see the Web color conversion function, suddenly think of when we do some

How to stitch a large number of strings in JavaScript _javascript tips

There are heredoc ways to define strings in PHP and Python: Php: Copy Code code as follows: $sql =SELECT * From pages where Pagename= ' $PN ' EOD; Python: Copy Code code as follows: Print "" " This is

Pure JavaScript realizes simple drop-down refresh function _javascript skill

The code is very simple, the implementation of the function is very practical, directly to the code Css: Copy Code code as follows: pull to Refresh Html: Copy Code code as follows: 1 2 3 4 5 6 7 8 9

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