1 function createCORSRequest(method, url){ 2      var xhr = new XMLHttpRequest(); 3       4      if("withCredentials" in xhr){ 5          xhr.open(method, url, true); 6      }else if(typeof XDomainRequest != "undefined"){ 7          xhr = new XDomainRequest(); 8          xhr.open(method, url); 9      }else{10          xhr = null;11      }12 13      return xhr;14 }15 16 var request = createCORSRequest("get", "http://www.somewhere-else.com/page/");17 18 if(request){19     request.onload = function(){20          //对request.responseText 进行处理21     }22 23     request.send();24 }