入门级问题
jquery的ajax和原生js的ajax
第一种
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head> <title>Ajax</title> <script src="http://code.jquery.com/jquery-latest.js" type="text/javascript"></script> <script type="text/javascript"> window.onload = function () { var xmlhttp; if (window.XMLHttpRequest) { xmlhttp = new XMLHttpRequest(); } else { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.open("GET", "http://seman.com/ajax.js?version=" + Math.random(), true); xmlhttp.setRequestHeader("Content-type", "text/javascript"); xmlhttp.send(); } </script></head><body> <div style="width:100px;height:100px;background-color:Yellow;"> </div></body></html><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head> <title>Ajax</title> <script src="http://code.jquery.com/jquery-latest.js" type="text/javascript"></script> <script type="text/javascript"> $(window).load(function () { $.ajax({ url: "http:seman.com/ajax.js?version=" + Math.random(), dataType:"script" }); }) </script></head><body> <div style="width:100px;height:100px;background-color:Yellow;"> </div></body></html>document.getElementsByTagName("div")[0].style.backgroundColor = "red";