这个文件写在ty.com域名下
<!DOCTYPE html>
<html>
<script type="text/javascript" src='./js/jquery.js'></script>
<head>
<title>跨域</title>
<meta charset="utf-8">
</head>
<body>
<button class="btn_click">点击</button>
<script type="text/javascript">
$('.btn_click').click(function(){
console.log(1)
$.ajax({
type:"post",
url:"http://ty.com/test.php", //请求成功
// url:"http://www.baidu.com", //Referrer Policy: no-referrer-when-downgrade
data:{
},
dataType: "JSON",
success:function(data){
console.log(2)
},
error:function(e){
console.log(e)
}
})
})
</script>
</body>
</html>跨域问题基于浏览器，解决方法有在后端请求和应用jsonp