ajax 跨域请求

  		 $.ajax({  
             type : "get",  
             async:false,  
          	url: pdbasefurl+"tourist/getToken.action",   
             dataType : "jsonp",//数据类型为jsonp  
             jsonp: "jsonpCallback",//服务端用于接收callback调用的function名的参数  
             success : function(data){  
         	iczoomtokenname=data.result.split(",")[0];
         	iczoomtokenvalue=data.result.split(",")[1];
         	var pdfurls=null
        	if($(".defaultpdfurl").val().indexOf("images/public/basicproduct")>-1){
       
        		 pdfurls =$(".defaultpdfurl").val()+"?"+iczoomtokenname+"="+iczoomtokenvalue+"&iczoomtokenname="+iczoomtokenname
      	}else{
      		pdfurls =$(".defaultpdfurl").val()
      	}
       	 $("#displayPdfIframe").attr("src",pdbasefurl+"iczoompdf.html?file=" + encodeURIComponent(pdfurls));	    
             },  
             error:function(){  
                 alert('pdf 不存在');  
             }  
         });