1.跨域请求Access to XMLHttpRequest at 'http://localhost:8080/api/user/login' from origin 'http://localhost

在被请求的php文件中加入请求头部

header('Access-Control-Allow-Origin: *');

*.php

<?php 
    header('Access-Control-Allow-Origin: *');
    $arr = [
        array('id'=>1,'title'=>'one1'),
        array('id'=>2,'title'=>'one2'),
        array('id'=>3,'title'=>'one3'),
        array('id'=>4,'title'=>'one4'),
    ];

    echo json_encode($arr);
 ?>

index.html

<script type="text/javascript" src="jq.js"></script>
<script type="text/javascript">
    $.ajax({
        type:'post',
        url: 'http://127.0.0.1/demo1/api.php',
        contentType: "application/x-www-form-urlencoded",
        dataType: 'json',
        success: function(res){
            console.log(res)
        }
    })
</script>

在这里插入图片描述