在head first js上看到創(chuàng)建XMLHttpRequest對(duì)象var?request?=?null?;
if(window.XMLHttpRequest){
try{
????request?=?new?XMLHttpRequest();
}?catch(e){
????request?=?null;
????}
?}else?if(window.ActiceXObject){
?try{
????request?=?new?ActiveXObject("Msxml2.XMLHTTP");
????}catch(e){
????try{
????request?=?new?ActiveXObject("Microsoft.XMLHTTP");
????}catch(e){
????request?=?null;
????}
??}
}????
在W3c上看到?
var?xmlhttp;
if?(window.XMLHttpRequest)
??{//?code?for?IE7+,?Firefox,?Chrome,?Opera,?Safari
??xmlhttp=new?XMLHttpRequest();
??}
else
??{//?code?for?IE6,?IE5
??xmlhttp=new?ActiveXObject("Microsoft.XMLHTTP");
??}請(qǐng)問這一串是針對(duì)哪類瀏覽器，或者說它是干嘛用的，new ActiveXObject("Msxml2.XMLHTTP");w3c上沒有是代表它已經(jīng)過時(shí)了嗎？
Ajax的小問題
再去西藏
2015-11-06 13:21:22
