Question

asp如何实现异步传输验证验证码，就是在输入验证码的同时判断验证码的值是否正确并在输入框后面进行提示！

请各位大虾详细解疑！小弟菜鸟！不胜感激！

Answer 1

function showHint(str)
{
var xmlhttp;
if (str.length==0)
{
document.getElementById("txtHint").innerHTML="";
return;
}
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","gethint.asp?q="+str,true);
xmlhttp.send();
}

Answer 2

要用到js判断