Javascript:通过将路径作为字符串传递给对象来从对象中获取深层值 [英] Javascript: Get deep value from object by passing path to it as string

问题描述

可能的重复:
使用字符串键访问嵌套的 JavaScript 对象

也许标题不够清楚，我只是不知道如何指定我要找的东西，而且我的英语真的很糟糕，抱歉.

Maybe the title is not clear enough, I just didn't know how to specify what I'm looking for and my English is really bad, sorry.

我正在尝试创建返回对象值的函数，但也可以很好地处理嵌套对象.例如:

I'm trying to create function that returns object value, but also plays nice with nested objects. For example:

var obj = {
  foo: { bar: 'baz' }
};

我想通过向函数提供字符串foo.bar"来访问 obj.foo.bar 的值.

I want to access the value of obj.foo.bar by suppling the string "foo.bar" to the function.

function(obj, path) {
  // Path can be "foo.bar", or just "foo".
}

谢谢！

推荐答案

考虑一下:

var obj = {
  foo: { bar: 'baz' }
};

function deepFind(obj, path) {
  var paths = path.split('.')
    , current = obj
    , i;

  for (i = 0; i < paths.length; ++i) {
    if (current[paths[i]] == undefined) {
      return undefined;
    } else {
      current = current[paths[i]];
    }
  }
  return current;
}

console.log(deepFind(obj, 'foo.bar'))

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