需要在服务器上进行哈
jquery的ajax方法：
// jquery请求
$.ajax({
url: "./server/slider.json",
type: "post",
dataType: "json",
async: true,
success: function(datas) {
renderData(datas.slider);
}
}) // jquery渲染数据
function renderData(data) {
var str = "";
$.each(data, function(index, obj) {
str += '<a href="' + obj.linkUrl + '"><img src="' + obj.picUrl + '"></a>'
})
$("#banner_jq").html(str);
}
跨域请求，封装jsonp函数
function getJSONP(url, callback) {
if (!url) {
return;
}
var a = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j'];
//定义一个数组以便产生随机函数名
var r1 = Math.floor(Math.random() * 10);
var r2 = Math.floor(Math.random() * 10);
var r3 = Math.floor(Math.random() * 10);
var name = 'getJSONP' + a[r1] + a[r2] + a[r3];
var cbname = 'getJSONP.' + name; //作为jsonp函数的属性
if (url.indexOf('?') === -1) {
url += '?jsonp=' + cbname;
} else {
url += '&jsonp=' + cbname;
}
var script = document.createElement('script');
//定义被脚本执行的回调函数
getJSONP[name] = function(e) {
try {
callback && callback(e);
} catch (e) {
//
} finally {
//最后删除该函数与script元素
delete getJSONP[name];
script.parentNode.removeChild(script);
}
}
script.src = url;
document.getElementsByTagName('head')[0].appendChild(script);
}
// 跨域调用
getJSONP('http://class.imooc.com/api/jsonp', function(response) {
console.log(response);
});
json和ajax登录功能
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<title>Register</title>
<meta charset="utf-8">
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
<div class="register">
<p class="title" id="title">
<span>登 录</span>
<span class="current">注 册</span>
</p>
<div class="form">
<div>
<span>+86</span>
<input type="text" name="user" id="user" placeholder="请输入注册手机号" autocomplete="off"/>
<i id="user_icon"></i>
<p class="info" id="user_info"></p>
</div>
<div>
<input type="password" name="pwd" id="pwd" placeholder="请设置密码">
<i id="pwd_icon"></i>
<p class="info" id="pwd_info"></p>
</div>
<p class="button">
<a href="javascript:void(0)" id="sigup-btn" class="btn show">注 册</a>
<a href="javascript:void(0)" id="login-btn" class="btn">登 录</a>
</p>
</div>
</div>
<script type="text/javascript" src="js/ajax.js"></script>
<script type="text/javascript">
var user = document.getElementById("user"),
pwd = document.getElementById("pwd"),
sigup = document.getElementById("sigup-btn"),
login = document.getElementById("login-btn"),
titles = document.getElementById("title").getElementsByTagName("span");
userInfo = document.getElementById("user_info"),
userIcon = document.getElementById("user_icon")
pwdInfo = document.getElementById("pwd_info"),
pwdIcon = document.getElementById("pwd_icon"),
userReg = /^1[3578]\d{9}$/,
pwdReg = /^\w{5,12}$/,
isRepeat = false; // 记录用户名是否被占用
// 检测用户
function checkUser(){
var userVal = user.value;
// 验证手机号是否有效
if(!userReg.test(userVal)){
userInfo.innerHTML = '手机号码无效！';
userIcon.className = 'no';
}else{
userInfo.innerHTML = '';
userIcon.className = '';
// 发起请求
$.ajax({
url:'http://localhost/register/server/isUserRepeat.php',
data:{username:userVal},
success:function(data){
if(data.code == 1){
userIcon.className = 'ok';
isRepeat = false;
}else if(data.code == 0){
userIcon.className = 'no';
isRepeat = true;
userInfo.innerHTML = data.msg;
}else{
userInfo.innerHTML = '检测失败，请重试...';
}
}
})
}
} // 检测密码
function checkPwd(){
var pwdVal = pwd.value;
if(!pwdReg.test(pwdVal)){
pwdInfo.innerHTML = '请输入5到12位的字母、数字及下划线';
pwdIcon.className = 'no';
}else{
pwdInfo.innerHTML = '';
pwdIcon.className = 'ok';
}
} // 注册
function register(){
var user_val = user.value,
pwd_val = pwd.value;
// 如果手机号有效且没有被占用，同时密码合法，方可注册
if(userReg.test(user_val) && pwdReg.test(pwd_val) && !isRepeat){
// 发起请求，实现注册
$.ajax({
url:"http://localhost/register/server/register.php",
method:"post",
data:{username:user_val,userpwd:pwd_val},
success:function(data){
alert("注册成功，请登录！");
// 调用显示登录界面
showLogin();
// 清空文本框
user.value = "";
pwd.value = "";
},
error:function(){
pwdInfo.innerHTML = '注册失败，请重试！';
}
})
}
} // 显示登录
function showLogin(){
// 载入登录界面，登录高亮显示
titles[0].className = "current";
titles[1].className = "";
login.className = "show";
sigup.className = "";
} // 显示注册
function showSigup(){
// 载入注册界面，注册高亮显示
titles[1].className = "current";
titles[0].className = "";
login.className = "";
sigup.className = "show";
} // 绑定事件，检测用户的有效性及是否注册过
user.addEventListener("blur",checkUser,false); // 绑定事件，检测密码的有效性
pwd.addEventListener("blur",checkPwd,false); // 注册
sigup.addEventListener("click",register,false); // 登录高亮
titles[0].addEventListener("click",showLogin,false); // 注册高亮
titles[1].addEventListener("click",showSigup,false);
</script>
</body>
</html>
style.css
*{
margin:;
padding:;
}
body{
background:#333;
}
.register{
width:300px;
height:270px;
margin:80px auto;
padding:15px 30px;
background:#eee;
border-radius:5px;
}
.title{
height:35px;
}
.title span{
font-size:16px;
font-weight:bold;
color:#666;
margin-right:30px;
cursor:pointer;
}
.title span.current{
color:#f00;
}
.form div{
width:290px;
height:30px;
border-radius:8px;
background:#fff;
margin-bottom:40px;
padding:8px 10px;
position:relative;
}
.form div span{
display:inline-block;
padding-top:8px;
padding-right:3px;
color:#666;
}
.form div input{
border:none;
outline:none;
font-size:17px;
color:#666;
background:none;
}
.form div i{
position:absolute;
width:16px;
height:16px;
right:12px;
top:14px;
}
.form div i.ok{
background:url(../img/icon.png) no-repeat 0 -67px;
}
.form div i.no{
background:url(../img/icon.png) no-repeat -17px -67px;
}
.form .info{
margin-top:22px;
color:#f00;
padding-left:2px;
}
.button{
padding-top:7px;
}
.button a{
display:none;
width:100%;
height:45px;
line-height:45px;
text-align:center;
text-decoration:none;
background:#f20d0d;
color:#fff;
border-radius:30px;
font-size:16px;
}
.button a.show{
display:block;
}
ajax.js
var $ = {
ajax:function(options){
var xhr = null, // XMLHttpRequest对象
url = options.url, // url地址
method = options.method || 'get', // 传输方式，默认为get
async = typeof(options.async) === "undefined"?true:options.async,
data = options.data || null, // 参数
params = '',
callback = options.success, // ajax请求成功的回调函数
error = options.error;
// 将data的对象字面量的形式转换为字符串形式
if(data){
for(var i in data){
params += i + '=' + data[i] + '&';
}
params = params.replace(/&$/,"");
}
// 根据method的值改变url
if(method === "get"){
url += '?'+params;
}
if(typeof XMLHttpRequest != "undefined"){
xhr = new XMLHttpRequest();
}else if(typeof ActiveXObject != "undefined"){
// 将所有可能出现的ActiveXObject版本放在一个数组中
var xhrArr = ['Microsoft.XMLHTTP','MSXML2.XMLHTTP.6.0','MSXML2.XMLHTTP.5.0','MSXML2.XMLHTTP.4.0','MSXML2.XMLHTTP.3.0','MSXML2.XMLHTTP.2.0'];
// 遍历创建XMLHttpRequest对象
var len = xhrArr.length;
for(var i = 0;i<len;i++){
try{
// 创建XMLHttpRequest对象
xhr = new ActiveXObject(xhrArr[i]);
break;
}
catch(ex){
}
}
}else{
throw new Error('No XHR object availabel.');
}
xhr.onreadystatechange = function(){
if(xhr.readyState === 4){
if((xhr.status >=200 && xhr.status <300) || xhr.status === 304){
callback && callback(JSON.parse(xhr.responseText))
}else{
error && error();
}
}
}
// 创建发送请求
xhr.open(method,url,async);
xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xhr.send(params);
},
jsonp:function(){
// 跨域
}
}
isUserRepeat.php
<?php
header('Content-Type:application/json');
$isUsername = array_key_exists('username',$_REQUEST);
$username = $isUsername ? $_REQUEST['username'] : ''; if(!$username){
$msg = printMsg('参数有误',2);
echo json_encode($msg);
exit();
} function printMsg($msg,$code){
return array('msg'=>$msg,'code'=>$code);
} // 记录存储用户的文件路径
$fileStr = __DIR__.'/user.json'; // 读取现存的用户名和密码 $fileStream = fopen($fileStr,'r'); $fileContent = fread($fileStream,filesize($fileStr));
$fileContent_array = $fileContent ? json_decode($fileContent,true) : array();
fclose($fileStream);
// 判断用户名是否有重复的 $isrepeat = false; foreach($fileContent_array as $key=>$val){
if($val['username'] === $username){
$isrepeat = true;
break;
}
} if($isrepeat){
$msg = printMsg('用户名重复',0);
echo json_encode($msg);
exit();
}
$msg = printMsg('用户名可用',1);
echo json_encode($msg);
?>
register.php
<?php
header('Content-Type:application/json');
// 获取前端传递的注册信息 字段为 username userpwd
$isUsername = array_key_exists('username',$_REQUEST);
$isUserpwd = array_key_exists('userpwd',$_REQUEST);
$username = $isUsername ? $_REQUEST['username'] : '';
$userpwd = $isUserpwd ? $_REQUEST['userpwd'] : '';
function printMsg($msg,$code){
return array('msg'=>$msg,'code'=>$code);
} if(!$username || !$userpwd){
$msg = printMsg('参数有误',0);
echo json_encode($msg);
exit();
} // 记录存储用户的文件路径
$fileStr = __DIR__.'/user.json'; // 读取现存的用户名和密码 $fileStream = fopen($fileStr,'r'); $fileContent = fread($fileStream,filesize($fileStr));
$fileContent_array = $fileContent ? json_decode($fileContent,true) : array();
fclose($fileStream);
// 判断用户名是否有重复的 $isrepeat = false; foreach($fileContent_array as $key=>$val){
if($val['username'] === $username){
$isrepeat = true;
break;
}
} if($isrepeat){
$msg = printMsg('用户名重复',0);
echo json_encode($msg);
exit();
} array_push($fileContent_array,array('username'=>$username,'userpwd'=>$userpwd)); // 将存储的用户名密码写入
$fileStream = fopen($fileStr,'w');
fwrite($fileStream,json_encode($fileContent_array));
fclose($fileStream);
echo json_encode(printMsg('注册成功',1)); ?>
user.json
[{"username":"zhangsan","userpwd":"zhangsan"},{"username":"lisi","userpwd":"lisi"},{"username":"134","userpwd":"sdfsdf"},{"username":"135","userpwd":"dsff"},{"username":"136","userpwd":"dsff"},{"username":"13521554677","userpwd":"sdfsdf"},{"username":"13521557890","userpwd":"sdfsdf"},{"username":"13521557891","userpwd":"sdfsdf"},{"username":"13810701234","userpwd":"sdfsdf"},{"username":"13810709999","userpwd":"shitou051031"},{"username":"13810709998","userpwd":"sdfsdfdsf"},{"username":"13412345678","userpwd":"shitou"}]
杂七杂八的知识点：
jQuery 点击事件中触发的方式：
mousedown和mouseup事件鼠标左键点击和鼠标右键点击都是可以实现的；
click和dblclick事件只有鼠标左键点击才能实现
// jquery渲染数据
function renderData(data) {
var str = "";
$.each(data, function(index, obj) {
str += '<a href="' + obj.linkUrl + '"><img src="' + obj.picUrl + '"></a>'
})
$("#banner_jq").html(str);
}