ajax : aysnchronous javascript and xml
特点: 异步,局部的发送网络请求, 不必刷新页面.
封装:
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function ajaxFun (method, url, data, callback, flag) {
var xhr = null;
var flag = typeof flag == "undefined" ? true : flag;
if (window.XMLHttpRequest) {
xhr = new XMLHttpRequest();
} else{
xhr = new ActiveXObject("Microsoft.XMLHttp");// 兼容 ie
}
method = method.toUpperCase();
if (method == "GET") {
xhr.open(method,url + "?" + data,flag);
xhr.send();
} else{
xhr.open(method, url, flag);
xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xhr.send(data);
}
xhr.onreadystatechange = function () {
if(xhr.readyState == 4 && xhr.status == 200) {
callback(xhr.responseText);
}
}
}
简单案例
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewprot" content="width=device-width, initial-scale=1.0"/>
<meta http-equiv="X-UA-Compatible" content="ie=edge"/>
<title>dddd</title>
<style type="text/css">
</style>
</head>
<body>
<form action="#" method="post">
<input type="text" name="" id="username" value="" />
<input type="text" name="" id="age" value="" />
<input id="aaa" type="submit" value="提交"/>
<input id="bbb" type="submit" value="获取" />
</form>
<ul id="ul"></ul>
<script type="text/javascript">
function ajaxFun (method, url, data, callback, flag) {
var xhr = null;
if (window.XMLHttpRequest) {
xhr = new XMLHttpRequest();
} else {
xhr = new ActiveXObject("Microsoft.XMLHttp");
}
method = method.toUpperCase();
if (method == "GET") {
xhr.open(method,url + "?" + data,flag);
xhr.send();
} else if (method == "POST" ){
xhr.open(method,url,flag);
xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded")
xhr.send(data);
}
xhr.onreadystatechange = function () {
if(xhr.readyState == 4 && xhr.status == 200) {
callback(xhr.responseText);
}
}
}
const showlist = (data) => {
console.log(JSON.parse(data));
var list = JSON.parse(data);
let str = "";
list.forEach((item,index) => {
str += "<li>" + item.title + "---" + item.date + "</li>"
})
ul.innerHTML = str;
}
bbb.onclick = function (e) {
e.preventDefault();
ajaxFun('GET','./getNews.php',null,showlist,true);
}
const showName = (data) => {
alert(data);
}
aaa.onclick = function (e) {
e.preventDefault();
var name = username.value;
var agedata = age.value;
var data = "username=" + name + "&age=" + agedata;
ajaxFun('POST','./post.php',data,showName,true);
}
</script>
</body>
</html>
下面这俩php我是不太懂的. 不过大概能看懂. post.php
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<?php
header('content-type:text/html;charset="utf-8"');
error_reporting(0);
$username = $_POST['username'];
$age = $_POST['age'];
echo "名字：{$username},年龄：{$age}";
getNews.php
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<?php
header('content-type:text/html;charset="utf-8"');
error_reporting(0);
$news = array(
array('title'=>'的空间发几块的价格卡减肥的恐 惧感','date'=>'2014-1-6'),
array('title'=>'的空间发几块的价格卡减肥的恐 惧感','date'=>'2014-1-6'),
array('title'=>'的空间发几块的价格卡减肥的恐 惧感','date'=>'2014-1-6'),
array('title'=>'的空间发几块的价格卡减肥的恐 惧感','date'=>'2014-1-6'),
array('title'=>'的空间发几块的价格卡减肥的恐 惧感','date'=>'2014-1-6'),
array('title'=>'的空间发几块的价格卡减肥的恐 惧感','date'=>'2014-1-6'),
array('title'=>'的空间发几块的价格卡减肥的恐 惧感','date'=>'2014-1-6'),
array('title'=>'的空间发几块的价格卡减肥的恐 惧感','date'=>'2014-1-6'),
array('title'=>'的空间发几块的价格卡减肥的恐 惧感','date'=>'2014-1-6'),
array('title'=>'的空间发几块的价格卡减肥的恐 惧感','date'=>'2014-1-6'),
array('title'=>'的空间发几块的价格卡减肥的恐 惧感','date'=>'2014-1-6'),
array('title'=>'的空间发几块的价格卡减肥的恐 惧感','date'=>'2014-1-6'),
array('title'=>'的空间发几块的价格卡减肥的恐 惧感','date'=>'2014-1-6'),
array('title'=>'的空间发几块的价格卡减肥的恐 惧感','date'=>'2014-1-6'),
array('title'=>'的空间发几块的价格卡减肥的恐 惧感','date'=>'2014-1-6'),
array('title'=>'的空间发几块的价格卡减肥的恐 惧感','date'=>'2014-1-6')
);
echo json_encode($news);
