About responsive layout

　Responsive layout means that a website can be compatible with multiple types of terminals, but it does not need to make a specific web page version for each terminal. Responsive layout can provide a more comfortable interface and user experience for users on different terminals. With the emergence of more and more large-screen mobile devices, responsive layout has become a WEB technology widely used by developers.

Advantages:

　High flexibility when facing devices with different resolutions

　Can quickly solve the problem of multi-device display adaptation

Disadvantages:

　　Compatible with various devices, heavy workload and low efficiency

　　The code is cumbersome, hidden and useless elements will appear, and the loading time will be lengthened

　　In fact, this is a compromise design solution, which is affected by many factors and cannot achieve the best results

　　It has changed the original layout structure of the website to a certain extent, which may cause confusion among users

When talking about responsive layout, you have to think of CSS3’s Media Query, called media query. Media Query is easy to use, convenient and powerful. It is a powerful tool for making responsive layout. Using this tool, you can design various layouts very conveniently. An interface that is both rich and highly usable.

　Media query allows CSS to more accurately act on different media types and different conditions on the same media. Most media features of media queries accept min and max to express "greater than or equal to" and "less than or equal to". For example: width has min-width and max-width, which can be used in @media and @import rules in CSS, as well as in HTML and XML. Through this attribute, we can easily implement rich interfaces on different devices, especially mobile devices, which will be more widely used.

　Usage and structure

　　1. Use @media in link
　　　

　　　In the above usage, only can be omitted, limited to computer monitors. The max-width in the first condition refers to the maximum width of the interface to be rendered, and max-device-width is the maximum width of the device.

　　2. Embed @media

in the style sheet

　　　@media ( min-device-width:1024px ) and ( max-width:989px ), screen and ( max-device-width:480px ), ( max-device-width:480px ) and ( orientation:landscape ), ( min-device-width:480px ) and ( max-device-width:1024px ) and ( orientation:portrait ) {}

　　　　In this example, the computer monitor resolution (width) is set to be greater than or equal to 1024px (and the maximum visible width is 989px); handheld devices with a screen width of 480px and below; handheld devices with a screen width of 480px and placed horizontally; screen Width greater than or equal to 480px less than 1024px and CSS styles for vertically placed devices.

　　Responsive layout through media query

　　First define a fixed width under a standard browser (assuming the browser resolution is 1024px and the width is 980px), and then use Media Query to monitor the size change of the browser. When the browser resolution is less than 1024px , set the width of the page to a percentage display through the Media Query preset style sheet, so that the structural elements of the subpage will be adjusted accordingly according to the size of the browser. In the same way, when the visible part of the browser changes to a certain value, the structural elements of the page are adjusted accordingly according to the cascading style sheet preset by Media Query.

　　 We can also add to the of the page. This attribute is on mobile devices Set the original size display and whether to scale the statement.

　　Parameters:

　　width – the width of the viewport

　　Height – the height of the viewport

　　Initial-scale – initial scaling ratio

　　minimum-scale – the minimum ratio the user is allowed to zoom to

　　maximum-scale – The maximum ratio the user is allowed to zoom to

　　　user-scalable – whether the user can manually zoom

　 Media query is supported in most browsers, but not supported in a few browsers, such as IE browser. You need to use Media Query Javascript to solve it.