代码一：function submit() { if (validform() == true) { $.ajax({ type : "POST", url : baseUrl + accountTableName + "/update", contentType : "application/json", data : JSON.stringify({id: updateId,username: $('#username').val()}), beforeSend : function(xhr) {//请求头部的token字符串，确保用户已经通过验证 xhr.setRequestHeader("token", window.sessionStorage .getItem('token')); }, success : function(res) { if (res.code == 0) { alert("修改成功");//请求成功 //使用JavaScript中的sessionStorage对象来存储输入框中的用户名 window.sessionStorage.setItem('username',$('#username').val()) window.location.reload(); } else if (res.code == 401) { <%@ include file="../../static/toLogin.jsp"%> } else { alert(res.msg) } }, }); } else { alert("表单未填完整或有错误"); } }与代码二：function getId() { var userName = window.sessionStorage.getItem('username') accountTableName = window.sessionStorage.getItem('accountTableName')//获取存储的用户名以及表名 $.ajax({ type : "GET", url : baseUrl + accountTableName + "/page", data : { username : userName }, beforeSend : function(xhr) { xhr.setRequestHeader("token", window.sessionStorage .getItem('token'));//请求token字段,验证身份 }, success : function(res) { if (res.code == 0) { updateId = res.data.list[0].id $('#username').val(res.data.list[0].username)//赋值 } else if (res.code == 401) { <%@ include file="../../static/toLogin.jsp"%> } else { alert(res.msg); } }, }); } 有什么区别