jquery中ajax格式

<script type="text/javascript">

function fn1(){
//get异步访问
$.get(
"/WEB22/ajaxServlet2", //url地址
{"name":"张三","age":25}, //请求参数
function(data){ //执行成功后的回调函数
//{\"name\":\"tom\",\"age\":21}
alert(data.name);
},
"json"
);
}
function fn2(){
//post异步访问
$.post(
"/WEB22/ajaxServlet2", //url地址
{"name":"李四","age":25}, //请求参数
function(data){ //执行成功后的回调函数
alert(data.name);
},
"json"
);
}
function fn3(){
$.ajax({
url:"/WEB22/ajaxServlet2",
async:true,
type:"POST",
data:{"name":"lucy","age":18},
success:function(data){
alert(data.name);
},
error:function(){
alert("请求失败");
},
dataType:"json"
});
}
</script>