Javascript 数组/对象语法失败

发布于 2024-11-08 07:42:23 字数 460 浏览 0 评论 0原文

为什么我会在以下代码中收到此错误：Uncaught SyntaxError: Unexpected token { on line 1。

var cube_points = {
    {'x' : 100, 'y' : 100, 'z' : 100},
    {'x' : 100, 'y' : 100, 'z' : -100},
    {'x' : -100, 'y' : 100, 'z' : -100},
    {'x' : -100, 'y' : 100, 'z' : 100},
    {'x' : 100, 'y' : -100, 'z' : 100},
    {'x' : 100, 'y' : -100, 'z' : -100},
    {'x' : -100, 'y' : -100, 'z' : -100},
    {'x' : -100, 'y' : -100, 'z' : 100}
};

原文

Why do I get this error with this code: Uncaught SyntaxError: Unexpected token { on line 1.

var cube_points = {
    {'x' : 100, 'y' : 100, 'z' : 100},
    {'x' : 100, 'y' : 100, 'z' : -100},
    {'x' : -100, 'y' : 100, 'z' : -100},
    {'x' : -100, 'y' : 100, 'z' : 100},
    {'x' : 100, 'y' : -100, 'z' : 100},
    {'x' : 100, 'y' : -100, 'z' : -100},
    {'x' : -100, 'y' : -100, 'z' : -100},
    {'x' : -100, 'y' : -100, 'z' : 100}
};

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感受沵的脚步 2024-11-15 07:42:23

外部对象的元素有值但没有键。如果您想要一个立方体点数组，请使用方括号来表示数组文字：

var cube_points = [
    {'x' : 100, 'y' : 100, 'z' : 100},
    {'x' : 100, 'y' : 100, 'z' : -100},
    {'x' : -100, 'y' : 100, 'z' : -100},
    {'x' : -100, 'y' : 100, 'z' : 100},
    {'x' : 100, 'y' : -100, 'z' : 100},
    {'x' : 100, 'y' : -100, 'z' : -100},
    {'x' : -100, 'y' : -100, 'z' : -100},
    {'x' : -100, 'y' : -100, 'z' : 100}
];

如果您想要一个对象，请为项目提供一个键。这可以是数字、字母甚至对象：

var cube_points = {
    1: {'x' : 100, 'y' : 100, 'z' : 100},
    2: {'x' : 100, 'y' : 100, 'z' : -100},
    'q': {'x' : -100, 'y' : 100, 'z' : -100},
    'z': {'x' : -100, 'y' : 100, 'z' : 100},
    '25': {'x' : 100, 'y' : -100, 'z' : 100},
    '26': {'x' : 100, 'y' : -100, 'z' : -100},
    10: {'x' : -100, 'y' : -100, 'z' : -100},
    11: {'x' : -100, 'y' : -100, 'z' : 100}
};

显然，使用对象需要某种有序的键选择系统。由于您的点不容易命名，因此最好使用数组。但我想展示对象文字表示法是什么样子的。

Your outer object's elements have values but no keys. If you want an array of cube points, use the square bracket to denote an array literal:

var cube_points = [
    {'x' : 100, 'y' : 100, 'z' : 100},
    {'x' : 100, 'y' : 100, 'z' : -100},
    {'x' : -100, 'y' : 100, 'z' : -100},
    {'x' : -100, 'y' : 100, 'z' : 100},
    {'x' : 100, 'y' : -100, 'z' : 100},
    {'x' : 100, 'y' : -100, 'z' : -100},
    {'x' : -100, 'y' : -100, 'z' : -100},
    {'x' : -100, 'y' : -100, 'z' : 100}
];

If you want an object, give the items a key. This could be numbers or letters or even objects:

var cube_points = {
    1: {'x' : 100, 'y' : 100, 'z' : 100},
    2: {'x' : 100, 'y' : 100, 'z' : -100},
    'q': {'x' : -100, 'y' : 100, 'z' : -100},
    'z': {'x' : -100, 'y' : 100, 'z' : 100},
    '25': {'x' : 100, 'y' : -100, 'z' : 100},
    '26': {'x' : 100, 'y' : -100, 'z' : -100},
    10: {'x' : -100, 'y' : -100, 'z' : -100},
    11: {'x' : -100, 'y' : -100, 'z' : 100}
};

Obviously, using an object necessitates some kind of orderly system of key selection. Since your points aren't easily named, you're better off using an array. But I wanted to show what object literal notation would look like.

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你如我软肋 2024-11-15 07:42:23

您所拥有的不是有效的 javascript 对象定义。 {} 表示对象，因此内部应该有属性，而不是其他 {}。您需要的是一个用 []: 表示的数组，

var cube_points = [
    {'x' : 100, 'y' : 100, 'z' : 100},
    {'x' : 100, 'y' : 100, 'z' : -100},
    {'x' : -100, 'y' : 100, 'z' : -100},
    {'x' : -100, 'y' : 100, 'z' : 100},
    {'x' : 100, 'y' : -100, 'z' : 100},
    {'x' : 100, 'y' : -100, 'z' : -100},
    {'x' : -100, 'y' : -100, 'z' : -100},
    {'x' : -100, 'y' : -100, 'z' : 100}
];

然后您可以像这样访问它：

cube_points[2].y

What you have is not a valid javascript object definition. {} denotes object, so inside you should have properties, not other {}. What you need is an array which is denoted with []:

var cube_points = [
    {'x' : 100, 'y' : 100, 'z' : 100},
    {'x' : 100, 'y' : 100, 'z' : -100},
    {'x' : -100, 'y' : 100, 'z' : -100},
    {'x' : -100, 'y' : 100, 'z' : 100},
    {'x' : 100, 'y' : -100, 'z' : 100},
    {'x' : 100, 'y' : -100, 'z' : -100},
    {'x' : -100, 'y' : -100, 'z' : -100},
    {'x' : -100, 'y' : -100, 'z' : 100}
];

which you could then access like this: