通过ajax下载文件

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摘要：通过ajax方式下载文件

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// 下载方法
function download(url, fileName) {
    var xhh = new XMLHttpRequest();
    xhh.open("post", url, true);
    xhh.responseType = 'blob';
    xhh.onreadystatechange = function () {
        if (xhh.readyState === 4 && xhh.status === 200) {
            var blob = xhh.response;
            const url = window.URL.createObjectURL(blob);
            var link = document.createElement('a');
            link.href = url;
            link.download = fileName;
            link.click();
        }
    };
    xhh.send();
}

// 调用方法
download('https://image.dqv5.com/public/bear.png','bear.png');