js向php发送post请求失败，求解,该怎么处理

function alertWin(title, msg, w, h) { <br />        var titleheight = "22px"; // 窗口标题高度 <br />        var bordercolor = "#666699"; //窗口的边框颜色 <br />        var titlecolor = "#FFFFFF"; // 窗口的标题颜色 <br />        var titlebgcolor = "#666699"; // 窗口的标题背景色 <br />        var bgcolor = "#FFFFFF"; // 内容背景色 <br />        var iWidth = document.documentElement.clientWidth; //这个窗口的宽度 <br />        var iHeight = document.documentElement.clientHeight; //这个窗口的高度 <br />        //创建一个弹出层 <br />        var msgObj = document.createElement("div"); <br />        //设置弹出的层的样式 <br />        msgObj.style.cssText = "position:absolute;font:11px '宋体';top:" + (iHeight - h) / 2 + "px;left:" + (iWidth - w) / 2 + "px;width:" + w + "px;height:" + h + "px;text-align:center;border:1px solid " + bordercolor + ";background-color:" + bgcolor + ";padding:1px;line-height:22px;z-index:1001;"; <br />        document.body.appendChild(msgObj); <br />        //创建一个table用于容纳层上的内容 <br />        var table = document.createElement("table"); <br />        //将Table放到弹出层上 <br />        msgObj.appendChild(table); <br />        //设置table的格式 <br />        table.style.cssText = "margin:0px;border:0px;padding:0px;"; <br />        table.cellSpacing = 0; <br />        //插入一行用于显示标题 <br />        var tr = table.insertRow(-1); <br />        //插入一个单元格用于容纳标题 <br />        var titleBar = tr.insertCell(-1); <br />        titleBar.style.cssText = "width:100%;height:" + titleheight + "px;text-align:left;padding:3px;margin:0px;font:bold 13px '宋体';color:" + titlecolor + ";border:1px solid " + bordercolor + ";cursor:move;background-color:" + titlebgcolor; <br />        titleBar.style.paddingLeft = "10px"; <br />        //设置标题 <br />        titleBar.innerHTML = title; <br />        //关闭按钮事件 <br />        var closeBtn = tr.insertCell(-1); <br />        closeBtn.style.cssText = "cursor:pointer; text-align:right;padding:2px;background-color:" + titlebgcolor; <br />        closeBtn.innerHTML = "<span style='font-size:15pt;color:" + titlecolor + ";'>×</span>"; <br />        closeBtn.onclick = function() { <br />            document.body.removeChild(msgObj); <br />        } <br />        //弹出的消息窗口内容 <br />        var msgBox = table.insertRow(-1).insertCell(-1); <br />        msgBox.style.cssText = "font:10pt '宋体';"; <br />        msgBox.colSpan = 2; <br />        msgBox.innerHTML = msg; <br />        var nameBox1 = table.insertRow(-1); <br />        var nameLable1 = nameBox1.insertCell(-1); <br />        nameLable1.style.cssText = "font:10pt '宋体';text-align:center;"; <br />        nameLable1.innerHTML = "<tr><td align=\"right\">手机</td><td><input id=\"mobile\" name=\"mobile\" type=\"text\" size=\"15\" class=\"inputBg\" /><span style=\"color:#FF0000\"> *</span> <input id=\"zphone\" type=\"button\" value=\" 获取手机验证码 \" onClick=\"get_mobile_code();\"></td></tr>"; <br />		<br />		var nameBox2 = table.insertRow(-1); <br />        var nameLable2 = nameBox2.insertCell(-1); <br />        nameLable2.style.cssText = "font:10pt '宋体';text-align:center;"; <br />        nameLable2.innerHTML = "<tr><td align=\"right\">验证码</td><td><input type=\"text\" size=\"6\" name=\"mobile_code\" class=\"inputBg\" /></td></tr>"; <br />        <br />		var nameBox3 = table.insertRow(-1); <br />        var nameLable3 = nameBox3.insertCell(-1); <br />        nameLable3.style.cssText = "font:10pt '宋体';text-align:center;"; <br />        nameLable3.innerHTML = "<tr><td align=\"right\"></td><td><input type=\"submit\" value=\" 注册 \" class=\"button\"></td></tr>"; <br />	}<br /><br />	function get_mobile_code(){<br />		alert("111");<br />		$.post('http://'+serverIp+'smsExecute.php', {mobile:jQuery.trim($('#mobile').val()),send_code:<?php echo $_SESSION['send_code'];?>}, function(msg) {<br />            alert(jQuery.trim(unescape(msg)));<br />        });<br />        alert("222");<br />	}