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Parsing 11 difficult-to-understand problems in Javascript

1. Original value and reference value. The original value is stored in the stack, and the reference value is stored in the heap. For example, the program: copy the code as follows: function Person(id,name,age){this.id = id;this.name = name ;this.age = age

2025-01-18
In-depth understanding of Javascript scope and variable promotion

What is the result of the following program? Copy the code. The code is as follows: var foo = 1; function bar() {if (!foo) {var foo = 10;}alert(foo);}bar(); The result is 10; So what about the following one? Copy the code code as follows: var a

2025-01-18
js simply implements the prompt effect when deleting records

The style copy code is as follows:<style type="text/css"> body{font-size:13px} .divShow{line-height:32px;height:32px;background-color:#eee;wi

2025-01-18
Sample code for scaling webapp font size to follow system font size

Recently I worked on a webapp project, which is a hybrid development, with external native and internal webview nested H5 pages. The front-end is developed using vue, and the adaptation is made by flexible+rem. Everything was fine originally, but the lead

2025-01-18
Detailed explanation of the solution to the stuck scrolling of webapp pages

When the mobile browser scrolls the current page (and may also be zooming the page), the default behavior is blocked, causing the page to be forced to remain still, resulting in a poor user experience and a sense of pause when scrolling the page. A more s

2025-01-18
Implementation code for partial refresh of HTML page

Event response refresh: Refresh only when there is a request 1. Obtain HTML elements through JS HTML DOM or jQuery, monitor page events through DOM methods or jQuery methods, and obtain user requests; 2. Submit user requests to the server through Ajax, an

2025-01-18
HTML5 multi-threading (Web Worker)

When it comes to HTML5, people always talk about it. There are so many features and interesting APIs that are refreshing. However, many children's shoes still stay at the semantic stage and ignore the power of HTML5. In this section we will discuss mu

2025-01-18
h5 uses canvas to achieve gesture unlocking

Preface: I recently worked on an app project using apicloud to achieve cross-platform development. Now I need to add gesture (nine-square grid) unlocking function to this app. apicloud already has some third-party natively implemented gesture unlocking pl

2025-01-18
JS gets parameter data in URL

Copy the code as follows: function getParam(paramName) {paramValue = "";isFound = false;if (this.location.search.indexOf("?") == 0 && thi

2025-01-18
A brief discussion on the modifiability of JavaScript function parameters

It comes from thinking about a written test question. Normally, no one will modify the parameter value inside the function. It is only discussed here. There are three ways to modify it. 1. Directly modify the formal parameter copy code when declaring the

2025-01-18
A brief analysis of two types of global objects/functions in JavaScript

The JavaScript mentioned here refers to the browser environment including the host environment. The first is the ECMAScript Global Object, and the second is the global object/function under the host environment (Host). 1. Core JavaScript built-in objects,

2025-01-18
Perfectly solves the problem that lower versions of IE do not support call and apply.

Function.prototype's apply and call were only added in ECMA262 Edition3 released in 1999 (ECMA262 Edition2 was released in 1998). There is no ap in previous browsers such as IE5.01 (JScript 5.0)

2025-01-18
JavaScript subclasses use Object.getPrototypeOf to call parent class method analysis

Each function has a prototype attribute, called the prototype. Each object also has a prototype, which can be accessed through __proto__ in Firefox/Safari/Chrome/Opera. There is no relevant interface provided in IE6/7/8. Copy the code code as follows: fun

2025-01-18
Detailed explanation of the scaling function of canvas through transformation matrix

This article mainly introduces a way to achieve canvas scaling by setting the canvas's transformation matrix. The first step is to listen to the mouse wheel event. In the wheel event, based on the scrolling of the mouse and the previous transformation

2025-01-18
Implementation code for automatic line wrapping of canvas drawing text content

Prototype requirements: It is required to make an invitation card page, in which the number of words in the title is dynamic and can display up to 2 lines. If it exceeds 2 lines, an ellipsis will be added at the end of the second line of content. Accordin

2025-01-18

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