javascript - 准备一个具有相应值的日期数组

Question

0:{entry_counts: 2000, week_end_date: "2016-09-01"} 1:{entry_counts: 10000, week_end_date: "2016-09-08"} 2:{entry_counts: 20000, week_end_date: "2016-09 -22"} 3:{entry_counts: 40000, week_end_date: "2016-09-29"} 4:{entry_counts: 150000, week_end_date: "2016-10-13"}

Answer 1

由于您的日期不包含任何类型的时区甚至时间数据，因此它将被视为 UTC 时区。我们真的不需要时间来帮助我们解决这个问题。

您还在代码中使用了很长的引用，这使得代码更难以阅读并且更容易出错。 (例如:data.entryDetails[0].entry_counts[count].entry_counts;)我建议使用一些变量来减少这个问题。这还可以更轻松地检查该值是否有效甚至已定义。

当处理时间和增加时间时，valueOf 非常有用。我为你写了一个快速脚本。我确信可以通过一些错误检查并确保定义数据来改进它。除此之外，它应该对您有用!

节日快乐!

var countData    = [ {entry_counts: 2000, week_end_date: "2016-09-01"},{entry_counts: 10000, week_end_date: "2016-09-08"},{entry_counts: 20000, week_end_date: "2016-09-22"},{entry_counts: 40000, week_end_date: "2016-09-29"},{entry_counts: 150000, week_end_date: "2016-10-13"} ]
var today        = ( new Date() ).valueOf()

var currentEntry = parseEntry( countData.shift() )
var nextEntry    = parseEntry( countData.length ? countData.shift() : null )


var viewsArray   = []
var datesArray   = []

var time         = currentEntry.dateValue

while( time <= today ){
  
    // update currentEntry data used to the most up-to-date data we have
    if( nextEntry && time > nextEntry.dateValue ) {
      
      while( nextEntry && time > nextEntry.dateValue ){
        
        currentEntry = nextEntry
        nextEntry    = parseEntry( countData.length ? countData.shift() : null )
        
      }
      
    }
      
    viewsArray.push( currentEntry.views )
    datesArray.push( new Date( time ) )
  
    time += daysInMilliseconds(7)

}


console.log( viewsArray )


function parseEntry( entry ) {
  
  if( !entry ) return null
  
  entry.date      = new Date( entry.week_end_date )
  entry.dateValue = entry.date.valueOf()
  entry.views     = entry.entry_counts
  
  return entry
  
}


function daysInMilliseconds( days ) {
  
  return days * 24 * 60 * 60 * 1000
  
}