Javascript：将对象数组推送到数组 [英] Javascript: Push array of objects to array

问题描述

我有一个对象数组（全局范围）：

I have an array of objects (global scope):

objects =[{id:"0",radius:3,},{id:"1",radius:2,}].

此数组通过更改单个对象来操纵：

This array is being manipulated by changing the single objects:

objects =[{id:"0",radius:4,},{id:"1",radius:5,}].

或通过将新对象推入数组：

or by pushing new objects to the array:

objects =[{id:"0",radius:4,},{id:"1",radius:5,},{id:"2",radius:3,}].

每次操作后，我想将整个数组保存到另一个名为 history的数组中，以便能够回忆起每个州。

After each manipulation, I want to save the entire array to another array called "history" to be able to recall each state.

我尝试过：

var history_obj =[];

var history_index = 0;

function save_to_history(){history_obj[history_index]=objects; history_index++;} 

，并且：

function save_to_history(){history_obj.push(objects); history_index++;} 

我调试了脚本，发现在运行save_to_history（）函数之后我的history_obj包含n个数组，但是所有数组都是相同的（应该被推为最后一个数组）不是[[state1]，[state2]，[state3]]而是[[

I've debugged the script and found out, that after running the save_to_history() function n times my history_obj contains a number of n arrays, however all arrays are the same (the one that would be supposed to be the last one to be pushed) not [[state1],[state2],[state3]] but [[state3],[state3],[state3]].

我在这个论坛上已经读到，这个问题与范围有关。

I've read in this forum, that this Problem has to do with the scope.

所以我试过：

function save_to_history(){
var status = objects; 
history_obj[history_index]=status;
history_index++;} 

结果相同。
预先感谢您的帮助。

The result is the same. Thanks in advance for your help.

推荐答案

您要将相同的引用添加到历史记录中，首先需要克隆它，然后添加它，就像这样：

You are adding the same reference into your history, you need to first clone it and then add it in, like so:

JSON.parse(JSON.stringify(arr));

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