Do the JSON keys have to be surrounded by quotes?（轉載）

問

Example: Is the following code valid against the JSON Spec?

{
    precision: "zip"
}      

Or should I always use the following syntax? (And if so, why?)

{
    "precision": "zip"
}      

I haven't really found something about this in the JSON specifications. Although they use quotes around their keys in their examples.

答

Yes, you need quotation marks. This is to make it simpler and to avoid having to have another escape method for javascript reserved keywords, ie {for:"foo"}.

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