Question

我正在尝试使用Google App脚本中的拼接来提取2D数组的子集。 A是从中创建两个数组info []和ttdata []的输入数组。以下是代码：

function SpliceTest()
{
  var A = [[1,2,3,4,5,6],[1,2,3,4,5,6],[1,2,3,4,5,6], 
  ["","","","1","",""],["","","","","2",""]]
  Logger.log(A)      
   var spliced = SpliceData(A)
  Logger.log(A)
}

function SpliceData(data)
{
  var info = []
  var ttdata = []
  for(var j = 0; j < 2; j++)
   {
     info[j] = data[j].splice(4, 2)
  }
  for(var j = 2; j < data.length; j++)
  {
     ttdata[j-2] = data[j].splice(0, 4)
   }
   return [info, ttdata]
 }

问题是，执行spliceData子例程会修改我无法理解的输入数组A。

下面是执行SpliceData子例程之前和之后的A值。

[19-01-25 11:28:05:493 CET] [[1.0, 2.0, 3.0, 4.0, 5.0, 6.0], [1.0, 2.0, 3.0, 4.0, 5.0, 6.0], [1.0, 2.0, 3.0, 4.0, 5.0, 6.0], [, , , 1, , ], [, , , , 2, ]]
[19-01-25 11:28:05:494 CET] [[1.0, 2.0, 3.0, 4.0], [1.0, 2.0, 3.0, 4.0], [5.0, 6.0], [, ], [2, ]]

Answer 1

在这里，正如特豪霍（Tehhowch）在评论中提到的那样，您需要slice()而不是splice()

此外，如果您阅读了文档，您会发现拼接会修改原始数组，而slice会对其进行浅表复制。

function SpliceTest()
{
  var Logger = console
  var A = [[1,2,3,4,5,6],[1,2,3,4,5,6],[1,2,3,4,5,6], 
  ["","","","1","",""],["","","","","2",""]]

   var spliced = SpliceData(A)
  Logger.log("Spliced Array:")
  Logger.log(spliced)
  Logger.log("Original Array A:")
  Logger.log(A)
}

function SpliceData(data)
{
  var info = []
  var ttdata = []
  for(var j = 0; j < 2; j++)
   {
     info[j] = data[j].slice(4)
  }
  for(var j = 2; j < data.length; j++)
  {
     ttdata[j-2] = data[j].slice(0, 4)
   }
   return [info, ttdata]
 }
 SpliceTest()

注意：我修改了代码，即var Logger = console，以便可以在此处作为代码段运行！

在Google App脚本中使用.splice（）时出现问题

1 个答案: