我将如何使用括号表示法中的单个变量访问深度值? [英] how would I go about accessing a deep value using a single variable in bracket notation?

问题描述

我想知道如何执行以下操作 - 我有以下数据:

I am wondering how to do the following- I have the following data:

dta = {
       "fielddata": {
           "text1": "4B030C2E-3D53-4DF8-A3535EF377B45DE5",
           "text2": "Unlabeled"
       }
}

我可以像这样使用括号表示法访问

Which I can access using bracket notation like so

var result = dta["fielddata"]["text1"];

没问题，我可以像这样使用变量

no problem there, And I can use variables like so

var val1 = "fielddata",
    val2 = "text1",
    acc = dta[val1][val2];

log(acc);

再一次，太棒了-但是当我只有一个保存点符号的变量时呢?

again, terrific- but how about when I only have a single variable holding the dot notation?

比如，如果我只有

var val = "fielddata.text1",
    acc = dta[val];
log(acc);

这将产生一个未定义的.关于如何解决这个问题的任何想法?

This would yield an undefined. Any thoughts on how to go about this?

非常感谢！马可

推荐答案

var val = "fielddata.text1",
    acc = dta,               // reference the base object
    parts = val.split('.'),  // split the val into an Array of individual parts
    i;

  // Iterate the parts, updating acc each time
for( i = 0; i < parts.length; i++ )
    acc = acc[parts[i]];

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