Editing 从 ZIP 导出大文件 Excel NET牛人

<!doctype html>
<html lang="zh-cn">

<head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />

    <meta charset="utf-8" />

    <title>从 ZIP 导出大文件 Excel</title>

    <script src='https://npm.elemecdn.com/jszip@3.7.1/dist/jszip.min.js' async></script>
    <script src='https://npm.elemecdn.com/xlsx@0.17.4/dist/xlsx.full.min.js' async></script>
</head>

<body>

    <p>从 ZIP 导出大文件 Excel</p>
    <small>示例压缩包约 668KB ，原始文件约 5.6MB，下载解压读取文本再解析为 JSON 数组，再填充 Excel，最后下载 Excel 约 14MB，是压缩的 21倍</small>
    <input class="nr-ziplink" placeholder="JSON 文件压缩为 ZIP 的下载链接" value="https://s1.netnr.com/tmp/stats-zoning-4.zip" />

    <button class="nr-export">导出</button>
    <small>请打开浏览器控制台看输出</small>
</body>

</html>

* {
    color: deeppink;
}

input {
    width: 100%;
    margin: 1em 0;
}

var zipLink = document.querySelector('.nr-ziplink');
var exportBtn = document.querySelector('.nr-export');
exportBtn.addEventListener('click', function () {
    exportExcelFromZip(zipLink.value);
});

function exportExcelFromZip(url) {
    console.debug("下载包...")
    fetch(url).then(function (response) {
        return response.arrayBuffer();
    }).then(function (buffer) {
        console.debug("读取包...")
        var zip = new JSZip();
        zip.loadAsync(buffer).then(function (contents) {
            console.debug("提取文件...")
            Object.keys(contents.files).forEach(function (filename) {
                zip.files[filename].async('string').then(function (content) {
                    console.debug("JSON解析...")
                    var json = JSON.parse(content.trim())
                    console.debug(json)

                    console.debug("转换为 Excel...")
                    filename = filename.split('.')[0]; // 去掉后缀
                    var header = Object.keys(json[0]);

                    var workbook = XLSX.utils.book_new();
                    var worksheet = XLSX.utils.json_to_sheet(json, { header: header });
                    XLSX.utils.book_append_sheet(workbook, worksheet, filename);

                    console.debug("生成 Excel...")
                    XLSX.writeFile(workbook, filename + ".xlsx");
                })
            });
        });
    });
}