如何存储和检索我创建的 javascript 变量？

Question

我正在处理我发布的here 的后续问题，该问题已解决。

在我的应用程序中，我从输入表单（重力表单列表字段）上的动态字段中获取一组值。可以这样创建具有相同结构的测试数组：

var entries = new Array();
entries[0] = new Array( 1, 1, 2016, "9:00", "am", "5:00", "pm");
entries[1] = new Array( 1, 2, 2016, "9:10", "am", "5:10", "pm");

从左到右，这些值是：月、日、年、开始时间、开始时间段、结束时间、结束时间段。

由于它是动态输入 - 实际提交中可能有任意数量的子数组。

我的目标是拥有一组 unix 时间戳，可用于对表单提交进行验证。一个验证将是“当前日期是否比上次提交日期晚了 6 个月”。

以下代码演示了如何生成时间戳。

我正在寻找一种将无限数量的时间戳添加到我的数组的方法。

一旦我有了时间戳，我也在寻找一种定位时间戳的方法。

// Create an array to collect timestamps
var sessions = new Array();

// Ready the Zero Prepend-er so dates are always correct
function twoDigitFormat( num ) {
    return ( num.toString().length < 2 ? "0"+num : num ).toString();
}

// Loop through entries array to get each entry array
for ( i = 0; i < entries.length; i++ ) {
  var entry = entries[i];

  // Loop through each entry array to get the values
  for ( j = 0; j < entry.length; j++ ) {
    var value = entry[j];

    // get all of the parts
    var month = twoDigitFormat(entry[0]);
    var day = twoDigitFormat(entry[1]);
    var year = entry[2];
    var stime = entry[3];
    var stimeperiod = entry[4];
    var etime = entry[5];
    var etimeperiod = entry[6];
  }

  // Make Human Timestamps for each entry array
  var sessionStartString = month+'-'+day+'-'+year+' '+stime+''+stimeperiod;
  var sessionEndString = month+'-'+day+'-'+year+' '+etime+''+etimeperiod;

  // I'm using moments.js for time handling     
  // Make Session Moments for each timestamp
  var sStartMoment = moment( sessionStartString, "MM-DD-YYYY HH:mm a");
  var sEndMoment = moment( sessionEndString, "MM-DD-YYYY HH:mm a");

  // Make UNIX format moments for each timestamp
  var sStartUnix = sStartMoment.unix();
  var sEndUnix = sEndMoment.unix();

  // Add each UNIX timestamp to the sessions array
  // How do I add arrays with a variable as a key? I don't want to 
  // specify the key. Someone should be able to create 10 entries, 
  // or 20 entries, or .. whatever count.
  sessions[0] = new Array ( sStartUnix );
  sessions[1] = new Array ( sEndUnix ); 
}

// Get the current time (and as UNIX)
var now = moment();
var nowUnix = now.unix();

// Loop through sessions
for ( l = 0; l < sessions.length; l++ ) {
    var session = sessions[l];  

  // How do I get things out of the array of timestamps? 
  // My current code results in session[key] being UNDEFINED?
  var lastSession = session[session.length-1];      

}

// Do stuff - like math, to run validations
// I know this isn't correct, but the idea will be to get
// a difference in hours
var lastNowDiff = nowUnix - lastSession;

if ( lastNowDiff > 4320 ) {
  alert('The submission date must be within 6 months.');
}

我有 running in a Fiddle 如果你有时间去看看。

Answer 1

使用数组的推送方法。

例子：

var entries = new Array();
entries.push(new Array( 1, 1, 2016, "9:00", "am", "5:00", "pm"));

你可以像这样添加任意数量的数组。

完整的小提琴：https://jsfiddle.net/jryven/ovc2f1b7/

Answer 2

使用 JavaScript Date 对象进行解析和验证。