如何使用 Javascript 从给定的 URL 下载 GIF [英] How to download a GIF from a given URL using Javascript
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问题描述
我正在尝试从 Giphy 下载 GIF(只需要下载它,我不需要在浏览器上显示).
I am trying to download a GIF from Giphy (just need to download it, I don't need to display it on the browser).
我尝试使用这个问题中的解决方案这个问题 但是它会下载一个静态图像:
I tried using the solution in this question this question however it downloads a static image:
function download_img(e, link){
var image = new Image();
image.crossOrigin = "anonymous";
image.src = link;
image.onload = function () {
var canvas = document.createElement('canvas');
canvas.width = this.naturalWidth; // or 'width' if you want a special/scaled size
canvas.height = this.naturalHeight; // or 'height' if you want a special/scaled size
canvas.getContext('2d').drawImage(this, 0, 0);
var blob;
// ... get as Data URI
if (image.src.indexOf(".jpg") > -1) {
blob = canvas.toDataURL("image/jpeg");
} else if (image.src.indexOf(".png") > -1) {
blob = canvas.toDataURL("image/png");
} else if (image.src.indexOf(".gif") > -1) {
blob = canvas.toDataURL("image/gif");
} else {
blob = canvas.toDataURL("image/png");
}
tempbtn = document.createElement('a');
tempbtn.href = blob;
tempbtn.download = 'giphy.gif'; // or define your own name.
tempbtn.click();
tempbtn.remove();
};
}
<a href="#" onclick="download_img(this,'https://media2.giphy.com/media/DvyLQztQwmyAM/giphy.gif?cid=e9ff928175irq2ybzjyiuicjuxk21vv4jyyn0ut5o0d7co50&rid=giphy.gif')" > Descargar gif </a>
我也想知道为什么需要创建一个 new Image();
并创建一个 canvas 标签
I also wonder why it's needed to create a new Image();
and create a canvas tag
推荐答案
这对我有用,我从这里拿了一些代码https://randomtutes.com/2019/08/02/download-blob-as-file-in-javascript/
This works for me, I took some of the code from here https://randomtutes.com/2019/08/02/download-blob-as-file-in-javascript/
(async () => {
//create new a element
let a = document.createElement('a');
// get image as blob
let response = await fetch('https://media2.giphy.com/media/DvyLQztQwmyAM/giphy.gif?cid=e9ff928175irq2ybzjyiuicjuxk21vv4jyyn0ut5o0d7co50&rid=giphy.gif');
let file = await response.blob();
// use download attribute https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a#Attributes
a.download = 'myGif';
a.href = window.URL.createObjectURL(file);
//store download url in javascript https://developer.mozilla.org/en-US/docs/Learn/HTML/Howto/Use_data_attributes#JavaScript_access
a.dataset.downloadurl = ['application/octet-stream', a.download, a.href].join(':');
//click on element to start download
a.click();
})();
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