[英]Initializing a javascript object containing an array
I have the following C++ struct which I want to create as faithfully as possible in Javascript: 我有以下C ++结构,希望在Javascript中尽可能忠实地创建:
struct Vertex
{
float coords[4];
float colors[4];
};
So I did the following: 所以我做了以下事情:
function Vertex(coords, colors)
{
this.coords = [];
this.colors = [];
}
Now, the following works to create a Vertex instance: 现在,以下工作可创建一个Vertex实例:
var oneVertex = new Vertex();
oneVertex.coords = [20.0, 20.0, 0.0, 1.0];
oneVertex.colors = [0.0, 0.0, 0.0, 1.0];
but the following (slicker?) doesn't: 但是以下内容(闪烁吗?)没有:
var oneVertex = new Vertex([20.0, 20.0, 0.0, 1.0],
[0.0, 0.0, 0.0, 1.0]);
Why? 为什么? I am new to Javascript and what little I have read suggests it should be ok. 我是Java语言的新手,但我读到的东西很少,建议应该没问题。 Obviously not. 显然不是。 It would be helpful to understand what I am missing. 了解我所缺少的东西会有所帮助。 Thanks. 谢谢。
you need to use the arguments passed in to the function for it to work, as: 您需要使用传递给函数的参数才能使其正常工作,如下所示:
function Vertex(coords, colors)
{
this.coords = coords || [];
this.colors = colors || [];
}
You're constructor should initialize the properties: 您是构造函数,应初始化属性:
function Vertex(coords, colors)
{
this.coords = coords;
this.colors = colors;
}
var oneVertex = new Vertex([20.0, 20.0, 0.0, 1.0],
[0.0, 0.0, 0.0, 1.0]);
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