XMLHttpRequest: Origin null is not allowed by Acce

问题:

This question already has answers here:

Closed 7 years ago.

Possible Duplicate:
XmlHttpRequest error: Origin null is not allowed by Access-Control-Allow-Origin
XMLHttpRequest cannot load file://… Origin null is not allowed by Access-Control-Allow-Origin

I am trying to open my JSON file such as:

jQuery.getJSON('../data/json/en/nodesData.json',
      function(data){
           jQuery.each(data, function(){
                  //do something...
           })
     })

this yields the following error in Chrome:

XMLHttpRequest cannot load file:///C:/URL/data/json/en/nodesData.json. Origin null is not allowed by Access-Control-Allow-Origin

what's problem? How can I retrieve my json?

回答1:

You really should be running a local server like Apache or IIS to run HTML/JavaScript code so you do not run into these restrictions.

You can start the browser up with the flag --allow-file-access-from-files which removes the restriction.

回答2:

For security reasons, you cannot make AJAX calls to your local file system. Some browsers allow this, but others don't. Chrome has a flag that enables this, but it's off by default.

回答3:

Take a look into Same Origin Policy.

You cannot load the file because technically it is located in another domain. You need to call it like localhost/<Path>/nodesData.json.