Question

我知道,我们能够在 run印物体的运行期间创造新的财产,但财产也可以被分配价值? 例如。

var value = "New value";

var table = new Object();

var newValue = table[value];

现在我知道,价值表有一种新的财产,称为“价值”。但是,“价值的关键含有“新价值”的信息。因此,现在就这样说:

table = {
value:"New Value";
}

Answer 1

你们在分配时会混淆。

// Assigns a variable named  value  with a value of  New Value .
var value = "New value";
// Creates a variable named  table  as a blank Object.
var table = new Object(); // Alternatively - table = {};
// Attempts to access "New Value" from object "table" which returns undefined.
var newValue = table[value];

如果你想把财产分配给某个物体,那么你就是这样:

// Assumes table is still an object.
table[ key ] =  value ;

// Note that I almost _always_ opt for the variable[ key ] notation over
// the variable.key notation because it allows you to use keys
// that would otherwise not be valid as identifiers.
table[ Some Key ] =  Some Value ; // This works.
table.Some Key =  Some Value ; // This does not.

后来,当你想收回这一价值并把它储存在一个新的变数中时,你会这样做:

var newVariable = table[ key ];

希望能澄清一些。请允许我知道,我是否可以扩大这一部分。

Answer 2

页: 1

http://www.ohchr.org。

is not setting anything, and since at the time when you created table you didn t assign any property, newValue will be undefined.

如果您有一份分配价值的<条码>值/代码>变量,并且希望将这一数值分配到关键<条码>值/代码下。

<>代码>[价值] = 价值;

或替代

<代码>表>价值 = 数值

Answer 3

埃尔姆,第一点,我不认为你这样做是正确的。

所有这些都转让了<代码>un specified至newValue ,因为你试图查阅table s“ New Value”,而这种财产确实存在。

What I think you re trying to do is this:

var value = "New value";
var table = {};
table.value = value;

友情链接