js学习之 promise 练习ajax

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script type="text/javascript">
    
    ajaxC ("http://localhost/00.php");
    ajaxCPromise ("http://localhost/00.php");

    // 普通版
    function ajaxC (url){

        var ajax = new XMLHttpRequest();
        ajax.open('get',url,true);
        ajax.send();
        ajax.onload = (()=>{
            //00_webworker_demo.html
            console.log(ajax.responseText);
        });

        ajax.onerror = function(){
            console.log(ajax.status);
        }
    }

    // Promise版
    function ajaxCPromise (url){

        var ajax = new XMLHttpRequest();
        new Promise((succ,err)=>{
            ajax.open('get',url,true);
            ajax.send();
            ajax.onload = (()=>{
                succ();
            });

            ajax.onerror = function(){
                err();
            }
        }).then(()=>{
                console.log("Promise======succ========"+ajax.responseText);

        }).catch(()=>{
                console.log("Promise======err========"+ajax.status);

        });
        
    }
    </script>
</body>
</html>
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转载自blog.csdn.net/MENGCHIXIANZI/article/details/105260485