for..in循环遍历非数字索引“clean”和“remove” [英] for..in loop loops over non-numeric indexes “clean” and “remove”

问题描述

这是我可能在这里失踪的一些非常基本的东西，但是直到现在我还没有看到这样的结果。

我有一个for循环，其中options.headers.length是 3 。在for循环中，我动态创建一个表头。理想情况下，这个循环应该为 0 1和2 运行三次，但是当我打印索引时，它会打印 0,1,2，clean and remove 。我没有看到清理并删除作为索引。我知道这个信息是不够的，但如果你有任何线索，请建议。我的调试结果也是如此。

  for（index.headers中的索引）$ b $如果你不想遍历 




解决方案 clean 和 remove 然后改变循环为：

  for（var i = 0; i< options.headers.length; i ++）{
 //使用i获取数组
 
  

如果您使用 for（index.headers中的index），它会迭代非数字键。

This is something very basic I might be missing here but I haven't seen such result till now.

I have a for loop where options.headers.length is 3. And in for loop I am dynamically creating a table header. Ideally this loop should run three times for 0 1 and 2 but when I have printed index it's printing 0,1,2,clean and remove. I haven't seen clean and remove as indexes. I know this information is not sufficient enough but if you have any clue please suggest. something might be overriding this is all I am concluded too after my debugging.

for (index in options.headers)

解决方案

if you don't want to iterate clean and remove then change the loop to:

for (var i=0; i< options.headers.length;i++){
//use i for getting the array data
}

if you use for (index in options.headers) it will iterate for non-numeric keys also.

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