JSON和JavaScript对象文字中的有效名称之间的区别

Question

I have a JSON-formatted document like so:

{
    "the-field": "something",
    // etc
}

When I call foo = JSON.parse() it spits out an object literal with a field foo.the-field , but when I try console.log(foo.the-field) I'm told that it's not proper formatting for a JavaScript variable. What gives?

Answer 1

You need to use the bracket notation instead of dot notation as the member operator here

foo["the-field"]

From Docs

If you are using dot notation then

property must be a valid JavaScript identifier, ie a sequence of alphanumerical characters, also including the underscore ("_") and dollar sign ("$"), that cannot start with a number. For example, object.$1 is valid, while object.1 is not.