jquery中ajax的三种请求方式

$.ajax({
		type: 'post',
		async: false,
		url: "/index/Login/check",
		data: { "id": id, "password": password, "role_id": role_id },
		dataType: 'text',
		success: function (data) {
			if (data == "true") {
				top.location.href = "/index/index/index";
			} else {
				document.getElementById("error").innerHTML = data;
				var v = document.getElementById('imgcaptcha');
				v.src = '/index/Login/captcha?t/' + Math.random();
				return;
			}
		}
	});

$.post("/index/Login/check",
    {
	  id:id,
	  password,password,
	  role_id:role_id
    },
    function(data,status){
		if (data == "true") { 
			top.location.href="/index/index/index";
		} else {
			document.getElementById("error").innerHTML = data;
			var v = document.getElementById('imgcaptcha');
			v.src = '/index/Login/captcha?t/' + Math.random();
			return;
		}
    });

　　

 $.get("/ajax/ajax2",{"name":"张三","age":18},function(data){alert(data.name);},"json");