how to use foreach in javascript

background outside the screen through the background attribute of CSS. As long as the paths of these images remain unchanged, when they are called elsewhere on the web page, the browser will use pre-loaded (cached) images during rendering. Simple and efficient, without any JavaScript. Although this method is efficient, there is still room for improvement. The image loaded with this method is loaded togethe

This is my first study of JavaScript Learning Diary, at the beginning of writing this Bolg feel very basic and nowhere to write, but to put JavaScript code in the tags. the script can be placed in the will tell JavaScript where to start and end.The lines of code between contain JavaScript: Script > alert ("My first

I want to learn about the precision of javascript floating-point numbers, so that you can understand the real precision of JavaScript floating-point numbers, you can refer to the several numeric data types in most programming languages, but JavaScript has only one type. You can use the typeof operator to view the numer

I want to learn about the scope and scope chain of javascript. If you are interested, refer to the scope, which is one of the most important concepts of JavaScript, to learn JavaScript well, you need to understand the working principles of JavaScript scopes and scope chains. This article briefly introduces the

Usage and precautions of new in JavaScript: JavaScript, We Hardly new Ya -- Douglas Crockford. Http://yuiblog.com/blog/2006/11/13/javascript-we-hardly-new-ya/ Referencing JavaScript is a prototype-based language, but it has a new operator that makes it look like a classic object-oriented language. This also confuses pr

I want to learn about the improvement of var pre-parsing and function declaration in javascript. I am not familiar with the knowledge of var pre-parsing and function declaration. I will share this article with you. 1. var variable pre-Compilation The syntax of JavaScript is similar to that of C, Java, and C. If you have experience in C or Java programming, you should be familiar with the "declare first and

Verification Jslint may mark some structural errors as suspicious encoding practices. Some of them are listed below (For a complete list, refer to the jslint documentation ). L jslint requires that all code lines end with a semicolon. Although JavaScript does allow a line break as a line terminator, it is generally considered ambiguous and a bad encoding style. L if and for statements must be enclosed in braces. L different from otherProgramming L

using JavaScript to complete the city-province linkage effect The actual development will probably always encounter such a demand: on the registration page there are two Drop-down list boxes, the left province of the Drop-down list box in the value of a change, the right side of the city Drop-down list box in the value of the change, that is, the provinces and cities linkage. The effect is similar to the following:To

This article describes how to use JavaScript to obtain browser information and how to obtain browser addresses and parameters. For more information about browser information, see the navigator object in Window. we can use a series of API functions to learn browser information. The JavaScript code is as follows: Funct

This article describes how to use JavaScript to obtain the number of lies in ul, and describes how to use javascript to obtain HTML elements on pages and perform attribute operations, for more information about how to use JavaScript