ajax 增删改查

注册/登录怎么做：给数据库增加数据
页面：

<ul>
    <li>账号：<input class="num" type="text"></li>
    <li>密码：<input class="pwd" type="text"></li>
    <li>姓名：<input class="name" type="text"></li>
    <li>性别：<input class="sex" type="radio" name="sex" value="男" checked>男<input type="radio" name="sex" value="女">女</li>
    <li>年龄：<input class="age" type="text"></li>
    <li>邮箱：<input class="email" type="text"></li>
    <li>地址：<input class="address" type="text"></li>
    <li id="btn"><button>注册</button></li>
</ul>
<ul>
    <li>账号：<input class="usernum" type="text"></li>
    <li>密码：<input class="userpwd" type="text"></li>
    <li id="logo"><button>登录</button></li>
</ul>

js：

$("#btn").click(function () {
     var num = $(".num").val();
     var pwd = $(".pwd").val();
     var name = $(".name").val();
     var sex = $(".sex:checked").val();
     var age = $(".age").val();
     var email = $(".email").val();
     var address = $(".address").val();
     $.ajax({
         method: "post",
         url: "http://localhost:8080/regestInfo.php",
         data: {number: num, pwd: pwd, name: name, sex: sex, age: age, email: email, address: address},  //冒号前面为后台接收值，后面为给后台传的变量值
         success: function (res) {
             if (res == "success") {
                 console.log(res);
                 alert("注册成功！");
             }
         }
     });
});
$("#logo").click(function(){
     var userid=$(".usernum").val();
     var userpwd=$(".userpwd").val();
     $.ajax({
         method:"post",
         url:"http://localhost:8080/userLogin.php",
         data:{num:userid,pwd:userpwd},
         dataType:"json",
         success:function(res){
             if(res[0].count>0){
                 alert("登录成功！");
             }
         }
     });
});

regestInfo.php:

<?php
    header('Access-Control-Allow-Origin: * ');
	header('Content-type: text/html;charset=utf-8');
    //造连接对象
	$db = new MySQLi("localhost","root","12345678","blog");
 
	mysqli_query($db,"SET NAMES 'UTF8'");
	//写SQL语句
	$sql = "insert into user(number,pwd,name,sex,age,email,address) values('$_POST[number]','$_POST[pwd]','$_POST[name]','$_POST[sex]',$_POST[age],'$_POST[email]','$_POST[address]')";
	//检测连接数据库是否成功，失败返回“连接失败”，并退出程序 
	if(mysqli_connect_error()){
	 die("连接失败"); 
	}
	//执行SQL语句,返回结果集对象
	$result =  mysqli_query($db,$sql);
	if(!$result){
		echo "error";
	}
	else{
		echo "success";
	}
?>

userLogin.php:

<?php
    header('Access-Control-Allow-Origin: * ');
    //造连接对象
	$db = new MySQLi("localhost","root","12345678","blog");
 	mysqli_query($db,"SET NAMES 'UTF8'");
	//写SQL语句
	$sql = "select count(*) as count from user where number='$_POST[num]' and pwd='$_POST[pwd]'";
	//检测连接数据库是否成功，失败返回“连接失败”，并退出程序 
	if(mysqli_connect_error()){
	 die("连接失败"); 
	}
	//执行SQL语句,返回结果集对象
	$result =  mysqli_query($db,$sql);
	//判断结果有无数据
	$data=array();
	class User{
	public $count;
	}
	if($result->num_rows){
	 	while($row = mysqli_fetch_array($result))
   		 {
    		   $user=new User();
     		   $user->count=$row["count"];
        	   $data[]=$user;
 	         }
	}
	echo json_encode($data);
?>