PHP：

header('Access-Control-Allow-Origin:*'); header('Access-Control-Allow-Methods:POST,GET'); header('Access-Control-Allow-Credentials:true'); 

js:

$.ajax({ type: 'POST', url'https://to.com/postHere.PHP' crossDomain true data'{"some":"json"}' dataType'json' successfunction(responseData textStatus jqXHR) {var value = responseDatasomeKey;},0)"> errorfunction errorThrown alert('POST Failed.');}});