需要在服务器上进行哈
jquery的ajax方法：
我要评论 // 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
<!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:0;
padding:0;
}
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);
}
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