从原始问题更新
我正在尝试通过查看它的属性来了解 javascript 对象“看起来像”什么:
//create object without prototype
var obj = Object.create(null);
//add properties
obj.a = 3;
obj.b = 76.3;
obj.c = { a : 23 , b : true , c : 1};
obj.s = "ABC!";
//output string
var outStr = new String();
for(var prop in obj)
{
outStr += "Property " + prop + " is a " + typeof(obj[prop]) + " with value " + obj[prop] + "\n";
for(var prop1 in obj[prop])
{
outStr += "Property " + prop1 + " is a " + typeof(obj[prop][prop1]) + " with value " + obj[prop][prop1] + "\n";
for(var prop2 in obj[prop][prop1])
{
outStr += "Property " + prop2 + " is a " + typeof(obj[prop][prop1][prop2]) + " with value " + obj[prop][prop1][prop2] + "\n";
for(var prop3 in obj[prop][prop1][prop2])
{
outStr += "Property " + prop3 + " is a " + typeof(obj[prop][prop1][prop2][prop3]) + " with value " + obj[prop][prop1][prop2][prop3] + "\n";
for(var prop4 in obj[prop][prop1][prop2][prop3])
{
outStr += "Property " + prop4 + " is a " + typeof(obj[prop][prop1][prop2][prop3][prop4]) + " with value " + obj[prop][prop1][prop2][prop3][prop4] + "\n";
}
}
}
}
}
alert(outStr);
给出输出:
Property a is a number with value 3
Property b is a number with value 76.3
Property c is a object with value [object Object]
Property a is a number with value 23
Property b is a boolean with value true
Property c is a number with value 1
Property s is a string with value ABC!
Property 0 is a string with value A
Property 0 is a string with value A
Property 0 is a string with value A
Property 0 is a string with value A
Property 1 is a string with value B
Property 0 is a string with value B
Property 0 is a string with value B
Property 0 is a string with value B
Property 2 is a string with value C
Property 0 is a string with value C
Property 0 is a string with value C
Property 0 is a string with value C
Property 3 is a string with value !
Property 0 is a string with value !
Property 0 is a string with value !
Property 0 is a string with value !
现在,除了 String 属性 obj.s = "ABC!"之外,每个属性的行为都完全符合我的预期;
我知道 obj.s 包含属性(键和值):
“0”=“A”
“1”=“B”
“2”=“C”
“3”=“!”
从之前的回答(非常感谢@pimvdb 和@deestan)我了解到,因为这些属性值中的每一个都是字符串,它们也都包含属性键“0”,它本身也必须包含属性键“0”等等,等等?这就是为什么我要为字符串属性写出额外的行。
所以我的问题现在变成了:
所有属性值的类型是否应该在某个时候最终恢复为原始类型(如数字或 bool 值)以停止此递归链?我正在考虑实际保存这个对象的内存,当我开始编写这个小测试脚本来“查看”对象时,我基本上想查看所有基元以及对象如何存储它们,但实际上不能字符串到字符串到字符串的无限分配...我想它只是存储为字符串对象,它有 4 个字符(如果也有字符串结尾字符\0,则为 5 个)
最佳答案
可能不是所发布问题的答案,但我认为这是对您实际问题的答案::)
安装 Chrome 并打开 Javascript 控制台 (CTRL+SHIFT+J)。您可以在那里创建对象并从 Javascript 调试器中直观地检查它们。
> x = "stringystringstring"
"stringystringstring"
>
然后在右上角的“Watch Expressions”中添加x
进行检查。
如您所见,x
作为一个字符串并不是很有趣,所以让我们让它更复杂一些:
> x = { a: "b" }
|> Object
>
刷新 Watch Expressions 并展开 x
以查看对象结构。它应该看起来像这样:
v x: Object
a: "b"
v __proto__: Object
|> __defineGetter__: function __defineGetter__()...
|> __defineSetter__: function __defineSetter__()...
...
|> valueOf: function valueOf() { [native code] }
我们从中了解到对象 x
有一个属性,以及从对象原型(prototype)继承的一堆方法。
如果您需要查看可访问的所有 属性和方法,例如字符串,在控制台中输入 "derp".
。半秒后,应出现一个显示所有可用属性的自动完成列表。
关于Javascript对象调查,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9634249/