如何在JavaScript中将对象的所有值设置为null? [英] How to set all values of an object to null in JavaScript?

问题描述

我需要将某个对象的所有属性设置为 null .但是对象可能很大，所以我不能一一完成.

I need to set all properties of some object to null. But the object can be very big, so I can't just do it one by one.

如何一次设置所有属性?

How to set all properties at once?

推荐答案

这是一个有用的函数，称为"Object.keys()"，它返回对象的所有属性名称.

Here's a useful function called 'Object.keys()', it returns all of the attribute names of an object.

let setAll = (obj, val) => Object.keys(obj).forEach(k => obj[k] = val);
let setNull = obj => setAll(obj, null);

非箭头功能版本:

function setAll(obj, val) {
    /* Duplicated with @Maksim Kalmykov
        for(index in obj) if(obj.hasOwnProperty(index))
            obj[index] = val;
    */
    Object.keys(obj).forEach(function(index) {
        obj[index] = val
    });
}
function setNull(obj) {
    setAll(obj, null);
}

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