在javascript中清空普通对象的最有效方法是什么？ [重复]

This question already has an answer here:

这个问题在这里已有答案：

How to quickly clear a JavaScript Object? 7 answers
如何快速清除JavaScript对象？ 7个答案

As stated Here, It seems that the most efficient way to empty an existing array (and NOT to allocate a new one) in javascript is to use:

如上所述，似乎在javascript中清空现有数组（而不是分配新数组）的最有效方法是使用：

array.length = 0;

Does the same operation work for plain objects? (aka "associative arrays" or "dictionaries") If not, what is the most efficient way to empty an existing javascript object?

相同的操作是否适用于普通对象？（又名“关联数组”或“字典”）如果没有，清空现有javascript对象的最有效方法是什么？

I think that allocating a new one is not the best option, since it will push some extra work to the garbage collector, and will allocate some new memory on the heap, but I might be wrong.

我认为分配一个新的不是最佳选择，因为它会将一些额外的工作推送到垃圾收集器，并将在堆上分配一些新内存，但我可能错了。

I need a solution that works at least with Chrome and Firefox.

我需要一个至少适用于Chrome和Firefox的解决方案。

1 个解决方案

#1

The shortest way to do that is to create a new object. You'd end up garbage collecting all the properties anyway.

最简单的方法是创建一个新对象。无论如何，你最终会收集所有属性的垃圾。

var foo = {
    a: 5,
    b: 4
};
foo = {};

You could also iterate over the properties and remove them individually:

您还可以迭代属性并单独删除它们：

for (var prop in foo) {
    if (foo.hasOwnProperty(prop)) {
        delete foo[prop];
    }
}

It's also worth pointing out, as a matter of verbiage, that JavaScript has objects with properties, not associative arrays.

作为一个问题，值得指出的是JavaScript具有属性的对象，而不是关联数组。

#1