Ajax的基础使用
var xmlHttpRequest = false;function createXMLHttpRequest() {if (window.XMLHttpRequest) { xmlHttpRequest = new XMLHttpRequest();} else if (window.ActiveXObject) { try { xmlHttpRequest = new ActiveXObject("Msxml2.XMLHTTP");} catch (e1) { try { xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");} catch (e2) { xmlHttpRequest = false;}}}}function handleAjaxResult() { if (xmlHttpRequest.readyState == 4) { if (xmlHttpRequest.status == 200) {var responseStr = xmlHttpRequest.responseText; document.getElementById("checkName").innerHTML = responseStr;} else { }}}function executeAjaxCommand(){createXMLHttpRequest(); var COM_Name=document.thisForm.COM_Name.value;var url = "/erm/checkName";xmlHttpRequest.open("POST", url, true); //如果用GET会有缓存问题xmlHttpRequest.setRequestHeader("content-type","application/x-www-form-urlencoded");xmlHttpRequest.onreadystatechange = handleAjaxResult; xmlHttpRequest.send("COM_Name="+COM_Name);}?