Underscore.js中的递归/深度扩展/分配？ [英] Recursive/deep extend/assign in Underscore.js?

问题描述

有没有办法让Underscore.js extend 功能：

Is there any way to get Underscore.js extend function:

将源对象中的所有属性复制到
目标对象，并返回目标对象。它是有序的，
所以最后一个源会覆盖
之前参数中同名的属性。

Copy all of the properties in the source objects over to the destination object, and return the destination object. It's in-order, so the last source will override properties of the same name in previous arguments.

...递归工作？

实际上，在$ code> creditOperation 中的查询属性将会完全覆盖 baseOperation 中定义的查询属性：

Actually, query property in creditOperation is going to completely override the query property defined in baseOperation:

var url = require('url')
  , _ = require('underscore'),
  , baseOperation = {
        host: 'gateway.skebby.it',
        pathname: 'api/send/smseasy/advanced/http.php',
        protocol: 'https',
        query: {
            'username': 'foo',
            'password': 'bar',
        }
    };

var creditOperation = _.extend(baseOperation, {
    query: {
        'method': 'baz'
    }
});

console.log(url.format(creditOperation));

我想获得此 creditOperation ：

{
    host: 'gateway.skebby.it',
    pathname: 'api/send/smseasy/advanced/http.php',
    protocol: 'https',
    query: {
        'username': 'foo',
        'password': 'bar',
        'method': 'baz'
    }
}

推荐答案

不，下划线不包含深度扩展因为处理不同类型的对象太复杂了。相反，鼓励用户实现他们自己的解决方案并支持他们需要的东西。

No, Underscore will not contain a deep extend since it's too complicated to deal with different types of objects. Instead, users are encouraged to implement their own solutions with the support for what they need.

在你的情况下，它只是普通的对象，所以实现非常简单：

In your case it's only plain objects, so an implementation is quite straightforward:

_.deepObjectExtend = function(target, source) {
    for (var prop in source)
        if (prop in target)
            _.deepObjectExtend(target[prop], source[prop]);
        else
            target[prop] = source[prop];
    return target;
}

这篇关于Underscore.js中的递归/深度扩展/分配？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！