Shulou(Shulou.com)06/03 Report--

This article shows you what JavaScript's learning guide is like, which is concise and easy to understand. It will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

JavaScript is a scripting language belonging to the network, which has been widely used in Web application development. It is often used to add a variety of dynamic functions to web pages and provide users with a more smooth and beautiful browsing effect. Usually JavaScript scripts implement their own functions by embedding them in HTML.

Setting the defer attribute on the script element allows the browser to process the page part in advance and then process the script part when the page processing is finished and ready to display, which increases the speed of page loading.

/ / content

Putting the script element into the head element is beneficial to improve the maintainability of the web page, and putting the body element at the end can improve the loading speed of the page. Either way, you must ensure that the location of the script is consistent, either in the head element or at the end of the body element.

Define variables with the keyword var, and are local variables. If you do not use var, then variables are global and can be accessed inside and outside the function. Setting global variables is generally not recommended because it is easy to cause data loss.

It is best to provide an alternative for users who do not support or do not open JS, with the help of the noscript element. If the browser supports JS, the content in noscript is ignored, and if JS is not supported, the content in noscript is selected.

Function sayHello () {

[xss_clean] ln ("Hello JS")

}

Hello JS

Using the toString () method, you can change decimal integers to octal or hexadecimal.

Var intNumber = 16

Var octNumber = intNumber.toString (8)

Var hexNumber = intNumber.toString (16)

To reduce JS code, we can use some online compression tools, such as Packer.

The = = operator automatically converts the data type of the variable and then determines whether the values of the same data type are equal. = is a more stringent same judgment, and true is returned only if the Operand has the same value and type. The same is true of the difference between! = and! =

The Array object has four methods for maintaining queues and lists: push, pop, shift, and unshift. The push method adds the element to the end of the array, the unshift method adds the element to the beginning of the array, the pop method removes the last element of the array, and the shift method removes the first element.

The above is what the JavaScript study guide is like. Have you learned any knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.