仅保留JavaScript对象中的某些属性 [英] Keeping only certain properties in a JavaScript object

问题描述

我有一个对象。我想通过删除除某些特定属性之外的所有属性来修改对象（而不是克隆它）。例如，如果我开始使用此对象：

I have an object. I would like to modify the object (not clone it) by removing all properties except for certain specific properties. For instance, if I started with this object:

var myObj={
    p1:123,
    p2:321,
    p3:{p3_1:1231,p3_2:342},
    p4:'23423',
    //....
    p99:{p99_1:'sadf',p99_2:234},
    p100:3434
}

和只想要属性p1，p2和p100，我该如何获得这个对象：

and only want properties p1, p2, and p100, how can I obtain this object:

var myObj={
    p1:123,
    p2:321,
    p100:3434
}

我理解如何用蛮力做到这一点，但想要更优雅的解决方案。

I understand how I could do this with brute force, but would like a more elegant solution.

推荐答案

重新初始化对象：

myObj = {
    p1:   myObj.p1,
    p2:   myObj.p2,
    p100: myObj.p100
};

另一种方法是删除某些效果较差的属性：

Another way is to delete certain properties, which is less effective:

var prop = ['p1', 'p2', 'p100'];
for (var k in myObj) {
    if (prop.indexOf(k) < 0) {
        delete myObj[k];
    }
}

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