如何使用 JavaScript 从不同浏览器的 Web 服务响应中可靠地下载 PDF 文件？

<code class="javascript">var request = new XMLHttpRequest();
request.open("GET", "/path/to/pdf", true);
request.responseType = "blob";
request.onload = function (e) {
    if (this.status === 200) {
        // Generate .pdf name as `Blob` from `this.response`
        var file = window.URL.createObjectURL(this.response);
        var a = document.createElement("a");
        a.href = file;
        a.download = this.response.name || "detailPDF";
        document.body.appendChild(a);
        a.click();
        // Remove `a` after `Save As` dialog
        window.onfocus = function () {
            document.body.removeChild(a);
        };
    };
};
request.send();</code>