JavaScript-使用新关键字的标准 [英] JavaScript - standard in using new key word

问题描述

这是一个与内存使用和"new"关键字有关的问题.我需要您的建议和偏爱，以便在本地方法中使用新"字词.

This is a question which is related to memory usage and "new" keyword. I need your suggesions and preferences for using "new" in local methods.

get: function ()
{
    var get = new Ajax.Updater('resourceList',
    "url",
    {
        method: 'POST',
        onComplete: this._onComplete.bind(this)
    });
}

在上面的代码中，我将对象分配给一个在任何地方都不使用的局部变量，我也可以通过以下方式编写代码

In the above code, I am assigning the object to a local variable which is not used anywhere, I can write the code in the following way also

get: function ()
{
    new Ajax.Updater('resourceList',
    "url",
    {
        method: 'POST',
        onComplete: this._onComplete.bind(this)
    });
}

这里我没有将对象分配给任何变量.

Here I am not assigning the object to any variable.

我现在有点困惑.分配变量还是不分配变量哪个更好?如果我在局部方法作用域之后分配一个变量，则该对象将从内存中删除，但是如果我不分配，将发生什么?垃圾收集会处理吗?最好的方法是什么?就我个人而言，我更喜欢分配一个变量.那是对的吗?如果我不分配给变量，什么时候该对象会被破坏?

I am little confused now. Which way is better, assigning to a variable or not assigning to a variable? If I assign to a variable after the local method scope the object will be taken off from memory, but if I don't assign what will happen? Will it be taken care of by garbage collection? What is Which is the best way of doing it ? Personally I prefer to assign to a variable; is that correct? when will the object get destroyed if I am not assigning to a variable?

推荐答案

JavaScript垃圾收集器将处理超出范围的项目，并且这些项目不再可访问；无论您是否将Ajax.Updater对象分配给变量，都将如此.

JavaScripts garbage collector will process items as they fall out of scope, and are no longer reachable; this will be true for your Ajax.Updater object regardless of whether you assign it to a variable or not.

关于是否应将其分配给变量? 我不会.很明显，没有别的东西再次引用该对象.如果将其分配给变量，人们将开始寻找使用该变量的位置.

So as to whether you should assign it to a variable or not? I wouldn't. It makes it clear that nothing else refers to that object again. If you assign it to a variable, people will start looking to see where that variable is used.

垃圾收集器非常聪明且聪明.您几乎不必担心垃圾收集器是否会捡拾东西.在99.99999999％的情况下会.

The garbage collector is very clever and intelligent. You seldom need to worry about whether the garbage collector will pick up something or not. In 99.99999999% cases, it will.

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