javascript filereader example

This article describes how to implement the text size and font size function in Javascript. You can adjust the text size according to your habits. describes in detail the complete steps to implement this function. it is a very practical technique. If you need it, you can refer to the examples in this article to illustrate how to implement the text font size function in JavaScript. Share it with you for your

Example of a pop-up window in the lower right corner of javascript implementation, and a pop-up window in javascript This article describes how to use a pop-up window in the lower right corner of javascript implementation. Share it with you for your reference. The details are as follows: I hope this article will help

This article mainly introduces the use of javascript prototype chain inheritance. The example analyzes the skills and precautions in javascript prototype chain inheritance, which is of great practical value, if you need it, you can refer to the examples in this article to analyze the usage of javascript prototype chain

This section describes how to transmit parameters in javascript Functions. If you have any questions about parameter transfer, you may find yourself confused when passing function parameters, the reason is none. That is, its syntax is too weird. You define a function. For example Function test (name, msg) {return 'hello' + name + msg ;} So how do you call it? You can test ('Eric '), test ('Eric', '

This article mainly introduces the methods of javascript original values and object references. The example analyzes the functions, definitions, and related skills of javascript original values and object references, you can refer to the examples in this article to describe the original javascript values and object ref

This article mainly introduces the use of javascript prototype chain Inheritance. The example analyzes the skills and precautions in javascript prototype chain inheritance, which is of great practical value, if you need it, you can refer to the examples in this article to analyze the usage of javascript prototype chain

This article mainly introduces the operations of javascript on the drop-down list box (select. If you need it, you can refer to it and hope to help you in this article. It is mainly about the most basic methods related to javascript and select for reference by those who are not familiar with javascript. The common situation is that the person who proposes the for

This article mainly introduces the JavaScript Cookie operation method. The example analyzes the related skills of javascript For cookie operations. For more information, see the example below. Share it with you for your reference. The details are as follows: // My methods for setting, reading and deleting cookies.//

larger than the index at the largest character location, it is regarded as the largest possible index. Search from left to right. Otherwise, this method is the same as lastIndexOf. Example The following example illustrates how to use the indexOf method. The Code is as follows: Function IndexDemo (str2 ){Var str1 = "BABEBIBOBUBABEBIBOBU"Var s = str1.indexOf (str2 );Return (s );}

This article mainly introduces the JavaScript code example for testing the browser used by users, so that you can adjust the mobile edition or compatible page of the desktop edition based on the user's browsing status, for more information, see Capability DetectionCheck the capabilities of a specific browser before writing the code. For example, before a script c

This article describes how to register the event processing function in javascript using examples. The content is comprehensive. If you are interested, refer to the event as the core content of javascript, its importance is not described here. After an event is triggered, an event processing function is required. For example, we can define to set the background o

This article mainly introduces the usage of javascript text templates. It provides examples to analyze the implementation skills of text templates and has some reference value, you can refer to the following example to describe how to use a javascript Text Template. Share it with you for your reference. The details are as follows: This is a small function I wrot

This article mainly introduces the double exclamation mark (!) in JavaScript (!!) For more information, see the following example. The Code is as follows: Var;Var B = !! A; A is undefined by default .! A is true ,!! A is false, so the value of B is false, not undefined or another value, which is mainly to facilitate subsequent judgment. !! It is generally used to forcibly convert the following expressi

This article mainly introduces the usage of anonymous functions in JavaScript. The example analyzes the functions, definitions, and usage of anonymous functions in javascript, for more information about how to use anonymous functions in JavaScript, see the example in this ar

This article mainly introduces the JavaScript event delegation technology. The example analyzes the principle, applicability, and usage of event delegation technology. If you need it, you can refer to the example below to analyze the JavaScript event delegation technology. Share it with you for your reference. The spec

This article mainly introduces the pop-up window in the lower right corner of javascript implementation. The example analyzes the complete implementation steps and skills of the pop-up window in the lower right corner of javascript implementation, if you need it, refer to the example in this article to describe how to

!! It is generally used to forcibly convert the following expressions to boolean data. Because javascript is a weak language, it is sometimes required to forcibly convert it to the corresponding type !! It is generally used to forcibly convert the following expression to a boolean data (boolean), that is, it can only be true or false; We often see this example: The Code is as follows: Var;Var B = !! A; A

This article describes how to register the event processing function in javascript using examples. the content is comprehensive. if you are interested, refer to the event as the core content of javascript, its importance is not described here. After an event is triggered, an event processing function is required. for example, we can define to set the background o

This article mainly introduces the JavaScript component development method, analyzes the principle and implementation skills of the component in the form of a complete example, and provides detailed comments in the code for ease of understanding, for more information about JavaScript component development, see the examples in this article. We will share this with

This article mainly introduces the usage of javascript reference assignment (address-based value transfer). it uses a simple example to analyze the principle and usage of javacript reference assignment, which has some reference value, for more information, see the example in this article. Share it with you for your reference. The details are as follows: By def