Question

我使用代码

读取了一个csv文件

var x="dema.csv";
loadCSV(x);

function loadCSV(file) {
    if (window.XMLHttpRequest) {
        // IE7+, Firefox, Chrome, Opera, Safari
        var request = new XMLHttpRequest();
    } else {
        // code for IE6, IE5
        var request = new ActiveXObject('Microsoft.XMLHTTP');
    }
    // load
    request.open('GET', file, false);
    request.send();
    parseCSV(request.responseText);
}

我使用此代码将数据放入dataObject

function parseCSV(data, dataArray) {
    //replace UNIX new lines
    data = data.replace(/\r\n/g, "\n");
    //replace MAC new lines
    data = data.replace(/\r/g, "\n");
    //split into rows
    var rows = data.split("\n");

    // loop through all rows
    for (var i = 0; i < rows.length; i++) {
        // this line helps to skip empty rows
        if (rows[i]) {
            // our columns are separated by comma
            var column = rows[i].split(",");


            var date=column[0];
            var value = column[4];
            var dataObject = {
                date: date,
                T4: value
            };
        /
            dataArray.push(dataObject);
        }
    }

}

我只获得日期列和T4列。我的问题是，我想某种方式做一些处理（循环验证一些条件（例如：T4不应超过700超过30秒））我可以只使用dataObject或使用2D数组吗？如何使用正确的工具获取单元格内容？

Answer 1

var x = "dema.csv";
var dataArray = [];

loadCSV(x);

function loadCSV(x) {
    var xhttp = new XMLHttpRequest();
    xhttp.onreadystatechange = function () {
        if (this.readyState == 4 && this.status == 200) {
            parseCSV(this.responseText, dataArray);

            // you can loop over the array like this
            //dataArray.forEach((line) => {
            // here line contains data, time, tops, cycle, T4, test
            // you can access them like line.time, line.T4, line.tops etc
            // console.log(line.time);
            // console.log(line.tops);
            // etc
            //});
            window.alert(dataArray[0].T4);
        }
    };
    xhttp.open("GET", x, true);
    xhttp.send();
}

function parseCSV(data, arr) {
    //replace UNIX new lines
    data = data.replace(/\r\n/g, "\n");
    //replace MAC new lines
    data = data.replace(/\r/g, "\n");
    //split into rows
    var rows = data.split("\n");

    // loop through all rows
    for (var i = 0; i < rows.length; i++) {
        // this line helps to skip empty rows
        if (rows[i] && i > 0) {
            // our columns are separated by comma
            var column = rows[i].split(",");
            var dataObject = mapValuesToObj(column);
            arr.push(dataObject);
        }
    }
}

function mapValuesToObj(csvLine) {
    var absTime = csvLine[0];
    var time = csvLine[1];
    var tops = csvLine[2];
    var cycle = csvLine[3];
    var t4 = csvLine[4];
    var test = csvLine[5];
    return {
        date: absTime,
        time: time,
        tops: tops,
        cycle: cycle,
        T4: t4,
        test: test
    };
}

从DataObject csv文件javascript获取数据

1 个答案: