如何使用下划线克隆对象数组?

问题描述

#!/usr/bin/env node
var _ = require('underscore');
var a = [{f: 1}, {f:5}, {f:10}];
var b = _.clone(a);
b[1].f = 55;
console.log(JSON.stringify(a));

结果是:

[{"f":1},{"f":55},{"f":10}]

克隆似乎无法正常工作！因此，我进行RTFM，然后看到以下内容:

Clone does not appear to be working!So I RTFM, and see this:

http://underscorejs.org/#clone

所以 _.clone 几乎没有用.有没有一种方法可以实际复制对象数组?

So _.clone is pretty useless. Is there a way to actually copy the array of objects?

推荐答案

嗯，有个窍门！如果clone不克隆"嵌套对象，则可以通过显式克隆map调用中的每个对象来强制它！像这样:

Well, there is a trick! If clone does not "clone" nested objects, you can force it to by explicitly cloning each object inside a map call! Like this:

#!/usr/bin/env node
var _ = require('underscore');
var a = [{f: 1}, {f:5}, {f:10}];
var b = _.map(a, _.clone);       // <----
b[1].f = 55;
console.log(JSON.stringify(a));

打印:

[{"f":1},{"f":5},{"f":10}]

是的！ a 不变！我现在可以按自己的喜好编辑 b ！

Yay! a is unchanged! I can now edit b to my liking!

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