JavaScript sets browser zoom percentage

With the continuous development of computer technology, web page production has become one of the important fields. In the process of web page production, JavaScript is an extremely important programming language. It can make web pages dynamic and achieve various effects. Among them, page scaling is a problem often encountered in many web designs. In this article, we'll cover how to set the browser zoom percentage using JavaScript.

1. What is browser zoom

Browser zoom refers to adjusting the size of the web page through the browser's zoom function. It can shrink or enlarge the display of the page to adapt to different screen sizes or user needs.

2. Why do we need to set the browser zoom?

When designing a web page, sometimes we want the web page to be displayed within a specific size range. In this case, we need to set the browser zoom. Specific application scenarios include:

1. In order to present the best visual effect when designing a Web page, the page needs to be set to a specific size.
2. The content of the webpage is huge. In order to facilitate users' reading, some content may be reduced or enlarged.
3. In web page production, sometimes it is necessary to keep the page in a fixed size instead of deforming as the screen size changes. You also need to set browser zoom at this time.

3. How to set browser zoom through javascript

In javascript, we can set the browser zoom percentage through the document object. The implementation code is as follows:

window.onload=function(){
    document.body.style.zoom="80%";
}

Among them, 80% is the scaling percentage we set. Here we set the zoom attribute of the body element to 80%, achieving the effect of shrinking the page by 20%.

In addition, there are other applications in practice.

1. Directly set the scaling ratio of the browser page

var scale = window.devicePixelRatio;
document.body.style.zoom = 1 / scale;

In the above code, we obtain the pixel ratio of the current device through the window object, and then set the scaling ratio of the page is 1/scale, which is the reciprocal of the device pixel ratio, to achieve an adaptive effect.

2. Set the page scaling ratio according to the window size

function resizeWindow(){
    var screenWidth = window.innerWidth;
    var Zoom = screenWidth / 1920; 
    document.body.style.zoom = Zoom.toFixed(2); 
}

In the above code, we obtain the width of the current window through the window object, and then calculate the page scaling ratio. Here we assume that the window width is 1920px, use it as the standard width, calculate the ratio of the current window width to the standard width, and then set the zoom ratio of the page to this ratio value.

4. How to cancel browser zoom

When designing a web page, sometimes we may need to cancel browser zoom to keep the page from deforming. The implementation method is as follows:

document.body.style.zoom = 1;

Set the zoom attribute to 1 to cancel browser zoom. At this time, the page will maintain its original size and proportions.

5. Summary

Setting the browser zoom through JavaScript allows us to better control the display effect of the website and improve the user experience. In actual use, it is necessary to choose an appropriate scaling ratio or adaptive solution according to the actual situation to achieve the best page display effect. At the same time, it is recommended to avoid excessive use of the zoom function in web page production to avoid page fragmentation and degradation of user experience.

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