不适用内函数或者promise的方式，可以在外部提取到json数据
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <script> function createXHR(){ var xhr = null; if(window.XMLHttpRequest){ xhr = new XMLHttpRequest(); }else if(window.ActiveXObject){ xhr = new ActiveXObject("Microsoft.XMLHTTP"); } return xhr; } function test1(){ var xhr = createXHR(); xhr.open(‘GET‘,‘http://localhost/firstphp/js/SiteGPS.js‘,true); xhr.onreadystatechange = function(){ if(this.readyState == 4){ alert(this.responseText); } } xhr.send(null); } </script> </head> <body> <input type="button" value="更新歌曲" onclick="test1();"> <div id="lists"></div> </body> </html>
原文：http://www.cnblogs.com/vactor/p/6723153.html