ajax跨域调用和非跨域调用的写法

//支持跨域调用
	$.ajax({  
		type:"POST",async :false,url:"http://web3.com:9080/authority/dept/hellob.shtml?userName=zqb&callback=?",dataType:"jsonp",success:function(data){  
			//alert(data);
			console.log(data);
		},error:function(){  
		alert("error");  
		}  
		  
		});  

	  
	  }
	  //不支持跨域调用
	  function b(){
		  
		  $.ajax({
		        type: "post",dataType: "html",url: "http://web3.com:9080/authority/dept/hellob.shtml?userName=zqb",data: "",success: function (data) {
		        	console.log(data);
		        }
		    });
		  
	  }