标签：length ons send mysql 字符 sub inf roc div
//recvType 有三个值HTML、XML和JSON , 默认为HTML,传值时不区分大小写 //bool 是一个boolean类型的值，true表示异步传输方式，false表示同步传输方式，默认为true function Ajax(recvType, bool) { var aj = new Object(); aj.targetUrl = ‘‘; //请求的地址 可以是PHP也可以XML文件 aj.sendString = ‘‘; //请求服务器传递的字符串 ？ & 格式 url if(typeof(bool)=="undefined") aj.async=true; else aj.async=bool; aj.recvType=recvType ? recvType.toUpperCase() : ‘HTML‘;//HTML XML JSON aj.resultHandle = null; aj.ff; aj.createXMLHttpRequest = function() { var request = false; if(window.XMLHttpRequest) { aj.ff=true; request = new XMLHttpRequest(); if(request.overrideMimeType) { request.overrideMimeType(‘text/xml‘); } } else if(window.ActiveXObject) { aj.ff=false; var versions = [‘Microsoft.XMLHTTP‘, ‘MSXML.XMLHTTP‘, ‘Microsoft.XMLHTTP‘, ‘Msxml2.XMLHTTP.7.0‘, ‘Msxml2.XMLHTTP.6.0‘, ‘Msxml2.XMLHTTP.5.0‘, ‘Msxml2.XMLHTTP.4.0‘, ‘MSXML2.XMLHTTP.3.0‘, ‘MSXML2.XMLHTTP‘]; for(var i=0; i<versions.length; i++) { try { request = new ActiveXObject(versions[i]); if(request) { return request; } } catch(e) { request=false; } } } return request; } aj.XMLHttpRequest = aj.createXMLHttpRequest(); aj.processHandle = function() { if(aj.XMLHttpRequest.readyState == 4) { aj.ff=false; //如果是IE7以上则不再执行一次调用 if(aj.XMLHttpRequest.status == 200) { if(aj.recvType == ‘HTML‘) { aj.resultHandle(aj.XMLHttpRequest.responseText); }else if(aj.recvType == ‘JSON‘){ aj.resultHandle(eval(‘(‘+aj.XMLHttpRequest.responseText+‘)‘)); }else if(aj.recvType == ‘XML‘) { aj.resultHandle(aj.XMLHttpRequest.responseXML); } } } } aj.get = function(targetUrl, resultHandle) { aj.targetUrl = targetUrl; if(resultHandle!=null){ aj.XMLHttpRequest.onreadystatechange = aj.processHandle; aj.resultHandle = resultHandle; } if(window.XMLHttpRequest) { aj.XMLHttpRequest.open(‘GET‘, aj.targetUrl, aj.async); aj.XMLHttpRequest.send(null); } else { aj.XMLHttpRequest.open("GET", targetUrl, aj.async); aj.XMLHttpRequest.send(); } if(!aj.async && aj.ff) aj.processHandle(); } aj.post = function(targetUrl, sendString, resultHandle) { aj.targetUrl = targetUrl; if(typeof(sendString)=="object"){ var str=""; for(var pro in sendString){ str+=pro+"="+sendString[pro]+"&"; } aj.sendString=str.substr(0, str.length-1); }else{ aj.sendString = sendString; } if(resultHandle!=null){ aj.XMLHttpRequest.onreadystatechange = aj.processHandle; aj.resultHandle = resultHandle; } aj.XMLHttpRequest.open(‘POST‘, targetUrl, aj.async); aj.XMLHttpRequest.setRequestHeader(‘Content-Type‘, ‘application/x-www-form-urlencoded‘); aj.XMLHttpRequest.send(aj.sendString); if(!aj.async && aj.ff) aj.processHandle(); } return aj; }
使用方法：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <script src="ajax.js" type="text/javascript" charset="utf-8"></script> </head> <body> <form action="reg.php" method="post"> username:<input onblur="show(this.value)" type="text" name="username"/><span id="userInfo"></span><br /> password:<input type="password" name="password"/><span id="username"></span><br /> <input type="submit" value="submit"/> </form> </body> <script type="text/javascript"> function show(username){ $aj = new Ajax(); var userInfo = document.getElementById(‘userInfo‘); $aj.post(‘server.php‘,{username:username},function(data){ userInfo.innerHTML = data; }) } </script> </html>
<?php $mysqli = new mysqli(‘localhost‘,‘root‘,‘root‘,‘cms‘); $result = $mysqli->query("select * from cms_manage where admin_user = ‘{$_POST["username"]}‘"); if($result->num_rows > 0){ echo $_POST[‘username‘].‘已存在‘; }else{ echo $_POST[‘username‘].‘可以使用‘; }
标签：length ons send mysql 字符 sub inf roc div
原文地址：https://www.cnblogs.com/feelyourbreath/p/12604670.html
