在JavaScript中循环使用'Hashmap' [英] Loop through a 'Hashmap' in JavaScript

问题描述

我正在使用此方法在javascript中制作人造hashmaps。我所瞄准的是关键值对，实际运行时间并不重要。下面的方法工作正常。

是否有其他方式循环浏览？

  for（var i in a_hashMap [i]）{
 console.log（'Key is：'+ i +'。Value is：'+ a_hashMap [i]）; 
} 
  

我碰到一个问题，在第一个输出一串未定义的键之后键，当数组只包含一个条目时。我有一种感觉，因为代码是在使用i的循环中，即使我在调试时不应该发生这种情况。

任何人有任何想法？

解决方案

  for（var i in a_hashmap [i]）
  

不正确。它应该是

  for（var i in a_hashmap）
   a_hashmap 的属性，依次将每个属性名称分配给 i 
 
I'm using this method to make artificial 'hashmaps' in javascript. All I am aiming for is key|value pairs, the actual run time is not important. The method below works fine. 

Are there any other ways to loop through this?
for (var i in a_hashMap[i]) {
    console.log('Key is: ' + i + '. Value is: ' + a_hashMap[i]);
} 
I run into a problem where this outputs a bunch of undefined keys after the first key, when the array only contains one entry. I have a feeling it is because the code is within a loop which uses i, even though when I follow in debug it shouldn't be happening. I also cannot change i as the for loop seems to not understand the replaced var at all.

Anyone any ideas?
解决方案
for (var i in a_hashmap[i])
is not correct. It should be
for (var i in a_hashmap)
which means "loop over the properties of a_hashmap, assigning each property name in turn to i"

                        
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