</script>a.aspx提供可数据xmlhttp.open("GET","a.aspx",true);就是请求a.aspx.</script>把b.aspx中xmlhttp.open("GET","a.aspx",true);改成xmlhttp.open("GET","a.aspx?flag=1",true);则得到数据11111111111111xmlhttp.open("GET","a.aspx",true);改成xmlhttp.open("GET","a.aspx?flag=2",true);则得到数据22222222222222.//数据传输,flase为非异步方式 xmlhttp.open("Post","a.aspx",true); xmlhttp.onreadystatechange=function()