由于要做一个 UserScript 用到了这个功能，便顺便记录下来。
数组结构

var data = [
{
"title" :value,
"href" : value
},
...
]

生成 CSV 字符串

function convertArrayOfObjectsToCSV(args) {
        var result, ctr, keys, columnDelimiter, lineDelimiter, data;
        data = args.data || null;
        if (data == null || !data.length) {
            return null;
        }
        columnDelimiter = args.columnDelimiter || ',';
        lineDelimiter = args.lineDelimiter || '\n';
        keys = Object.keys(data[0]);
        result = '';
        result += keys.join(columnDelimiter);
        result += lineDelimiter;
        data.forEach(function(item) {
            ctr = 0;
            keys.forEach(function(key) {
                if (ctr > 0) result += columnDelimiter;
                result += item[key];
                ctr++;
            });
            result += lineDelimiter;
        });
        return result;
    }

生成 CSV 文件，并下载

function downloadCSV(args) {
        var data, filename, link;
        var csv = convertArrayOfObjectsToCSV({
            data: data
        });
        if (csv == null) return;
        filename = args.filename || 'export.csv';
        if (!csv.match(/^data:text\/csv/i)) {
            csv = 'data:text/csv;charset=utf-8,' + csv;
        }
        data = encodeURI(csv);
        link = document.createElement('a');
        link.setAttribute('href', data);
        link.setAttribute('download', filename);
        link.click();
    }

 
 
代码来源：https://halistechnology.com/2015/05/28/use-javascript-to-export-your-data-as-csv/