How do you read a file in the current directory using JQuery.getJSON()?
I'm trying something simple (with my data.json file in the same directory as my html file):
$.getJSON("./data.json")
and I get the error:
XMLHttpRequest cannot load file:///C:/Projects/test/data.json. Origin null is not allowed by Access-Control-Allow-Origin.
I've tried all sorts of combinations of path, but it doesn't seem to work...
EDIT: I'm using Chrome, but I'd like to work in all browsers...
If you are using Google Chrome, it is intentional that AJAX on file:/// paths never works.
This is because you're running your web files directly from your hard drive. There are various pitfalls in this, one of which you have found. Ideally you want to be working in a server environment, even locally. You can install a (free) local LAMP server such as XAMPP. Then, you'll be able to use local AJAX.
It's not about path
It's a cross-domain problem
Basically you need to add a callback in your URL, so that jQuery can automatically change the request type from json to jsonp
See this post for detail
An alternative to installing a local LAMP server is to use python's simple HTTP server. As long as you have python installed, just open up bash and use the python interpreter.
For python 2 use:
python -m SimpleHTTPServer 8000
For python 3 use:
python -m http.server 8000
Then just point your browser at localhost:8000 and you shouldn't have any trouble accessing the file if it's in the same directory.
来源：https://stackoverflow.com/questions/11297219/jquery-getjson-reading-a-local-file