HTML部分: function postRequest(strURL){ var xmlHttp; if(window.XMLHttpRequest){ // For Mozilla, Safari, … var xmlHttp = new XMLHttpRequest(); } else if(window.ActiveXObject){ // For Internet Explorer var xmlHttp = new ActiveXObject(“Microsoft.XMLHTTP”); } xmlHttp.open(‘POST’, strURL, true); xmlHttp.setRequestHeader(‘Content-Type’, ‘application/x-www-form-urlencoded’); xmlHttp.Onreadystatechange= function(){ if (xmlHttp.readyState == 4){ updatepage(xmlHttp.responseText); } } xmlHttp.send(strURL); } function updatepage(str){ if(str==”yes”){ alert(“Welcome User”); }else{ alert(“Invalid Login! Please try again!”); } } function call_login(){ var username = window.document.f1.username.value; var password = window.document.f1.password.value; var url = “login.php?username=” + username + “&password=” +password ; postRequest(url); }