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1.注意几个编码地方 1.1表单所在的网页的:meta <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 1.2XMLHTTPRequest GET的编码 httpRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); 此处设置不对!responseText会返回empty(没有内容),如果您有FireFox并装有FireBug组件的话,点击状态栏的绿色箭头打开控件面板(非OS的,FireBug的),选中Console会看到Response选项是: Illegal mix of collations (gbk_chinese_ci,IMPLICIT) and (latin1_swedish_ci,COERCIBLE) for operation ’= 当然如果是连接数据库的话也可能跟下面的(1.4)有关系. 1.3ajax GET请求的页面(.php)header header("Content-Type:text/html;charset=UTF-8"); 1.4数据连接的编码 mysql_query("SET CHARACTER SET UTF8"); 如果你的数据库是GBK的或其它的字符集,为了统一编码还要与以上三个统一起来.下面我的示例用的数据库也是GBK,从昨天开始我一起把它设成: mysql_query("SET CHARACTER SET GBK"); 可还是有时发现会返回空(empty 我用的是ResponseText),千万不要写成UTF-8噢,数据库的字符集是没有中间的"-" 2.如果还是返回空或无效的值 例如: a.html中有表单,a用XMLHTTPRequest和b.php通讯. 首先要保证b.php可以正确运行,例b.php?param=value打印出来的是你期望的值 如果a.html打印b.php返回的结果(ajax)与上面的(单独运行b.php)执行结果有出入.可以删除b.php中的空行试试!我想应该不会出现这种情况,但我有几次作demo删除后和删除前确实有出入 3.下面是朋友发给我的一个示例!我修改完的源码 表单页:3.1JS部分 function processRequest() { var tran; if (httpRequest.readyState == 4 || httpRequest.readyState == "complete") { if (httpRequest.status == 200 || httpRequest.statusText == "OK") { tran = httpRequest.responseText; //setGlobalValue(tran); alert(tran); } else { alert("您所请求的页面发生错误!"); } } } function sendRequest(strurl) { httpRequest = false; if (window.XMLHttpRequest) { // Mozilla, Safari, ... httpRequest = new XMLHttpRequest(); } else if (window.ActiveXObject) { // IE try { httpRequest = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { try { httpRequest = new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {} } } if (!httpRequest) { window.alert("通讯失败"); return false; } httpRequest.onreadystatechange = processRequest; httpRequest.open("GET", strurl, true); httpRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); httpRequest.send(null); }>} function processRequest() { var tran; if (httpRequest.readyState == 4 || httpRequest.readyState == "complete") { if (httpRequest.status == 200 || httpRequest.statusText == "OK") { tran = httpRequest.responseText; //setGlobalValue(tran); alert(tran); } else { alert("您所请求的页面发生错误!"); } } }
function sendRequest(strurl) { httpRequest = false; if (window.XMLHttpRequest) { // Mozilla, Safari, ... httpRequest = new XMLHttpRequest(); } else if (window.ActiveXObject) { // IE try { httpRequest = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { try { httpRequest = new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {} } } if (!httpRequest) { window.alert("通讯失败"); return false; } httpRequest.onreadystatechange = processRequest; httpRequest.open("GET", strurl, true); httpRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); httpRequest.send(null); }>} function asychronouscheck(strparam){ if(strparam.value.length == 0){ document.getElementById("state3").innerHTML="新帐号不能为空"; } var strurl="checknewaccount.php?name="+encodeURIComponent(strparam.value); sendRequest(strurl); <BR pre=""> function asychronouscheck(strparam){ if(strparam.value.length == 0){ document.getElementById("state3").innerHTML="新帐号不能为空"; } var strurl="checknewaccount.php?name="+encodeURIComponent(strparam.value); sendRequest(strurl); 表单部分 <dl> <dt>新帐号</dt> <dd><label id="state3"></label></dd> <dd><input type="text" name="nusername" id="nusername" size="26" maxlength="14" onblur="asychronouscheck(this)" /></dd> </dl> <dl> <dt>新帐号</dt> <dd><label id="state3"></label></dd> <dd><input type="text" name="nusername" id="nusername" size="26" maxlength="14" onblur="asychronouscheck(this)" /></dd> </dl>
php文件 <?php header("Content-Type:text/html;charset=UTF-8"); conn=mysql_connect(’localhost’,’root’,’bus’); mysql_select_db(’test’,conn); mysql_query("SET CHARACTER SET UTF8"); curName=GET[’name’]; if(emptyempty(curName)){ echo "新帐号不能为空"; exit(); } tSQL="SELECT uid FROM members WHERE username =’curName’"; try{ result=mysql_query(tSQL) OR die(mysql_error()); row = mysql_num_rows(result); flush(); if(row>0){ echo "false"; }else{ echo "true"; } mysql_free_result(result); mysql_close(conn); }catch(Exception e){ print e->getMessage(); } ?>