使用Java脚本将数据与文本文件分开

Question

我正在创建一个使用存储在文本文件中的数据的分析页面。 文本文件用于我的highcharts图，并按如下方式分隔：

November 7th 6AM,19.8
November 7th 6PM,19.8
November 8th 6AM,20.4
November 8th 6PM,14.6
November 9th 6AM,15.9
November 9th 6PM,15.1
November 10th 6AM,16.4
November 10th 6PM,16.4

我希望将这些数据分成12个日历窗格，以显示每个月的总体差异。 例如，如果某个日期的值为16，然后在下一次读取时将其降至10，以求出该月发生次数的累计总和。

我如何确保它以正确的顺序从文本文件中读取，并检查下一个值是否低于10并在某个位置进行计数？

Answer 1

您可以使用jQuery将文件数据分成数组。

$(document).ready(function() {
    //fetch text file
    $.get('text.txt', function(data) {
        //split on new lines
        var lines = data.split('\n');
        for(var i=0;i<lines.length;i++) {
            // use lines[i] the way you want
        }
    });
});

然后，您可以使用它来获取子字符串：

var a = s.indexOf(',');
var b = s.substring(a,4);

这样，您可以分离数据并根据需要使用它。

Answer 2

你需要

1. 提取数据文件
   • 通常使用AJAX（XMLHttpRequest）来做到这一点
2. 分离数据点
   • 您的数据似乎很整洁，可以为文件中的每一行使用line.split(" ")[0]获得月份的名称，并通过line.split(",")[1] 。 将文本拆分为行通常可以像text.split("\\n")一样容易。
3. 遍历结果
   • 对于您现在拥有的每个月值对，比较月的名称。 如果匹配，并且该值已被x更改，则在您的帐簿中增加一个值，例如discrepancies[monthName]++ 。 保存名称/值对，然后继续。

例：

 // Get the data var req = new XMLHttpRequest(); req.onreadystatechange = function() { if (req.readyState == 4 && req.status == 200) { // If the request is complete with status code "OK" handleImportantData(req.responseText); } }; // Define the request to be using the method GET to an URL asynchronously. req.open("GET", "important_data.txt", true); req.send(); function handleImportantData(data) { var treshold = 5.0; var months = {}; var discrepancies = {}; // Separate data points. var lines = data.split("\\n"); lines.forEach(function(line) { // The || 0.0 part sets the value to zero if our data is malformed. // We parse the value as a float to prevent it being saved as a string, // which would make arithmetic operations on it not work as expected. months[line.split(" ")[0]] = parseFloat(line.split(",")[1]) || 0.0; }); // Find discrepancies. var previous = { name: "", value: 0.0 }; for (var name in months) { // If not already there, initialize the data point with ternary operation including NOP. discrepancies[name] ? {} : discrepancies[name] = 0.0; // If we're still talking about the same month as before and the value // has changed for more than our treshold, save it as a discrepancy. if name === previous.name && Math.abs(previous.value - months[name]) > treshold { discrepancies[name] ++; } previous = { name: name, value: months[name] }; // Set this as the previous value. } // Here we have ready discrepancy data stored in the variable discrepancies. }