javascript Javascript将数组复制到新数组
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Javascript copy array to new array
提问by joedborg
I want to form an array from an existing array so I can modify the new array without affecting the old. I realise arrays are mutable and this is why the new array affects the old.
我想从现有数组形成一个数组，这样我就可以在不影响旧数组的情况下修改新数组。我意识到数组是可变的，这就是新数组影响旧数组的原因。
E.g.
例如
old = ["Apples", "Bananas"];
new = old;
new.reverse();
Old has also been reversed.
旧的也被颠倒了。
In Python, I can just do new = list(old), but doing new = new Array(old);puts the old list inside a list.
在 Python 中，我可以只做new = list(old)，但做new = new Array(old);将旧列表放入列表中。
回答by Benjamin Gruenbaum
You can use the .slicemethod:
您可以使用以下.slice方法：
var old = ["Apples", "Bananas"];
var newArr = old.slice(0);
newArr.reverse();
// now newArr is ["Bananas", "Apples"] and old is ["Apples", "Bananas"]
Array.prototype.slice returns a shallow copy of a portion of an array. Giving it 0 as the first parameter means you are returning a copy of all the elements (starting at index 0 that is)
Array.prototype.slice 返回数组一部分的浅拷贝。给它 0 作为第一个参数意味着您将返回所有元素的副本（从索引 0 开始）
回答by JaredPar
Try the following
尝试以下
newArray = oldArray.slice(0);
