How to call the browser to download pictures in vue

Vue is a very popular JavaScript framework that can be used to build front-end applications. Its powerful data binding and component development mechanism can free front-end engineers from tedious DOM operations and focus on the logic level. business processing. If you need to download the images fed back by the back-end to local storage in Vue, how should you do it? This article will introduce how Vue calls the browser to download images from two aspects.

1. Use HTML5 download attribute

HTML5 provides a new download attribute for specifying the download method of resources. When we specify this attribute, the browser will automatically start the download without our manual operation. In Vue, we can bind this attribute through v-bind and bind it to the corresponding image element or link element to implement the download operation. The specific steps are as follows:

1. Get the URL address of the file

In Vue, we can request the URL address of the file from the backend through axios or other plug-ins. For example:

axios.get("/api/getImage")
.then(response => {

// 获取到文件URL
const url = response.data.url;

})

2. Binding Download attribute

In the Vue template, we can bind the download attribute to the or element to implement click-to-download. For example:

or

Download Image

3. Download Image

When the user clicks on this element, the browser will automatically download the corresponding image file to the local. It should be noted that if you need to use the download attribute in Vue, its value must be specified, otherwise it will not take effect.

2. Download using JavaScript

If you need to implement the image download operation in JavaScript, we can create a element, set the address of the image to its href attribute, and then simulate Click the operation to trigger the browser's download behavior. The specific code is as follows:

// Create element
const link = document.createElement("a");
// Set the image address to its href attribute
link. href = url;
//Set the download file name
link.download = "image.png";
// Simulate click operation
document.body.appendChild(link);
link .click();
document.body.removeChild(link);

It should be noted that this method requires the use of native JavaScript to operate, and in Vue, it should be encapsulated as a method , to facilitate reuse.

Summary:

The above introduces how Vue calls the browser to download images, through HTML5 download attribute binding or JavaScript code. Both methods can achieve automatic downloading of images. During use, you need to pay attention to the binding or execution order of attribute values ​​to avoid errors.

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