javascript中'{}'的含义 [英] Meaning of '{ }' in javascript

问题描述

将变量分配给 {} 是什么意思？是将它初始化为函数吗？我在javascript文件中有代码，说明这个

What does assigning a variable to {}, mean? Is that initializing it to a function? I have code in a javascript file that says this

GLGE.Wavefront = function(uid) {
    GLGE.Assets.registerAsset(this,uid);
    this.multimaterials = [];
    this.materials      = {}; // <---
    this.instances      = [];
    this.renderCaches   = [];
    this.queue          = [];
};

该分配与数组有何不同？它是一种数组吗？

how is that assignment different from an array? Is it a type of array?

推荐答案

将变量赋给{}是什么意思？

What does assigning a variable to {}, mean?

这是 object literal （没有自己的属性）。

It is an object literal (with no properties of its own).

是否将其初始化为a函数？

Is that initializing it to a function?

不，那将是 = function（）{} 。

该分配与数组有何不同？

how is that assignment different from an array?

数组中有许多基本对象中没有的功能，例如 .length 和一组方法。

An array has a bunch of features not found in a basic object, such as .length and a bundle of methods.

对象通常用于存储任意键/值对。数组用于有序值。

Objects are often used to store arbitrary key/value pairs. Arrays are for ordered values.

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