出于安全原因，不允许从浏览器读取带有js的os文件。为此，必须在同一台服务器上读取csv文件和html页面，并使用ajax或某些服务器端语言生成json。我给你举一个ajax的例子

$(document).ready(function() {
    $.ajax({
        type: "GET",
        url: "datatable.txt",
        dataType: "text",
        success: function(data) {processData(data);}
     });
});

function processData(allText) {
    var record_num = 5;  // or however many columns there are in each row
    var allTextLines = allText.split(/\r\n|\n/);
    var entries = allTextLines[0].split(',');
    var lines = [];

    var headings = entries.splice(0,record_num);
    while (entries.length>0) {
        var tarr = [];
        for (var j=0; j<record_num; j++) {
            tarr.push(headings[j]+":"+entries.shift());
        }
        lines.push(tarr);
    }
    // alert

或者使用这个库https://www.cssscript.com/lightweight-csv-table-converter-csvtotable-js/