tv_xiaoyouxi/BackSystem/php/login.php

<?php
    header("Content-Type: text/html; charset=utf8");

    function getJson($result,$message){
        $json_array = array(
            "result"=>$result,
            "message"=>$message
        );

        return json_decode($json_array);
    }

    if(!isset($_POST["submit"])){
            exit("错误执行");
        }//检测是否有submit操作

        include('database_connect .php');//链接数据库
        $name = $_POST['name'];//post获得用户名表单值
        $passowrd = $_POST['password'];//post获得用户密码单值

        if ($name && $passowrd){//如果用户名和密码都不为空
                 $sql = "select * from user_info where user_name = '$name' and password='$passowrd'";//检测数据库是否有对应的username和password的sql
                 $result = mysql_query($sql);//执行sql
                 $rows=mysql_num_rows($result);//返回一个数值
                 if($rows){//0 false 1 true
                       echo getJson(0,"登陆成功")//如果成功跳转至welcome.html页面
                       exit;
                 }else{
                    echo getJson(-1,"用户名或密码错误");
                 }


        }else{//如果用户名或密码有空
                    echo getJson(-2,"表单填写不完整");
        }

        mysql_close();//关闭数据库