javascript setTimeout()传递函数参数(包括传递对象参数)_javascript技巧

function initAjax() {
var httprequest=null;
try {
httprequest=new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e) {
try {
httprequest=new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e) {
try {
httprequest=new XMLHttpRequest();
}
catch (e) {
httprequest=null;
}
}
}
return httprequest;
}
function doAjax( msg, obj ) {
var obj=obj; //主要是这一行
alert( obj.value);
var he="he="+msg;
var ajaxrequest=initAjax();
ajaxrequest.open("POST", "abc.jsp", true);
ajaxrequest.setRequestHeader( "Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
ajaxrequest.send(he);
ajaxrequest.onreadystatechange=function() {
if (ajaxrequest.readyState==4) {
if (ajaxrequest.status==200) {
document.getElementById("showpane").innerHTML=ajaxrequest.responseText;
}
else {
doAjax( msg );
}
}
}
setTimeout("doAjax(document.sform.txtara.value,document.all["+obj.sourceIndex+"])", 100);//还有这一行
}