a label download attribute failure solution

In order to realize the attachment download function in web pages, the download attribute of a tag is usually used, but for cross-domain image resources, the browser will directly open the image instead of downloading it.

<a download href="https://images.pexels.com/photos/15494499/pexels-photo-15494499.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1">图片下载</a>

plan 1

To process the image address page with the same source, you can configure the proxy in nginx to forward to the specified image address

location /image/ {
    
    
	proxy_pass https://images.pexels.com/
}

Scenario 2

Use ajax in JavaScript to get the image content, then dynamically create the file address, and complete the download by simulating the click event of the a tag

<a href="#" onclick="download()" title="点击下载">图片下载</a>
<script>
    function download() {
      
      
        let xhr = new XMLHttpRequest();
        xhr.onreadystatechange = function () {
      
      
            if (xhr.readyState === 4) {
      
      
                let link = document.createElement("a");
                let url = window.URL.createObjectURL(xhr.response);
                link.href = url;
                link.download = '1';
                link.click();
                window.URL.revokeObjectURL(url);
            }
        }
        // 需要指定响应类型为 blob
        xhr.responseType = "blob";
        xhr.open("get", "https://images.pexels.com/photos/15494499/pexels-photo-15494499.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1");
        xhr.send();
    }
</script>