(1)事件委托
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>事件委托</title>
<style type="text/css">
.list{
list-style: none;
}
.list li{
height: 30px;
background-color: green;
margin-bottom: 10px;
color: #fff;
}
</style>
<script type="text/javascript" src="js/jquery-1.12.4.min.js"></script>
<script type="text/javascript">
$(function(){
/*
给每个li绑定事件，一共绑定了8次，性能不高
$('.list li').click(function() {
alert($(this).html());
});
*/
/*
事件委托：方法delegate，只绑定一次事件，冒泡触发
参数：
selector选择器：写入ul下面的所有要发生事件的元素，多个元素用空格隔开，例如‘li a span’
eventType事件
function要执行的操作
$('.list').delegate('li', 'click', function() {
//$(this)指发生事件的子集，即每个li
alert($(this).html());
//取消委托
$('.list').undelegate();
});
})
</script>
</head>
<body>
<ul class="list">
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
<li>6</li>
<li>7</li>
<li>8</li>
</ul>
</body>
</html>
(2)节点操作
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>节点操作</title>
<style type="text/css">
</style>
<script type="text/javascript" src="js/jquery-1.12.4.min.js"></script>
<script type="text/javascript">
$(function(){
var $span = $('<span>span元素</span>');
var $p = $('<p>p段落元素</p>');
var $h = $('<h1>页面标题</h1>');
/*插入子元素*/
//div中插入span和p（末尾追加）
// $('#div1').append($span);
// $('#div1').append($p);
// 把span和p插入div中
$span.appendTo('#div1');
$p.appendTo('#div1');
//把子元素插入到父元素（前面追加）
// prepend()
// prependTo()
//在div前边插入兄弟h1标题
// $('#div1').before($h);
$h.insertBefore('#div1');
//在后边插入兄弟元素
//after()
//insertAfter()
//删除p标签
$p.remove();
})
</script>
</head>
<body>
<div id="div1"></div>
</body>
</html>
(3)ajax
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>ajax</title>
<style type="text/css">
</style>
<script type="text/javascript" src="js/jquery-1.12.4.min.js"></script>
<script type="text/javascript">
$.ajax({
url: 'data.json',//请求的服务器路径，实际开发中写文档接口的路径
type: 'get',//分get/post请求
dataType: 'json',//要读取什么格式的数据，xml script html upload
// data:{page:1}//请求时要携带的参数
})
.done(function(data){//成功的时候会执行的函数
alert(data.name);
console.log(data);
})
.fail(function(){//失败的时候
console.log("error");
})
/*.always(function(){//不论成功与否都会执行
console.log("always");
})*/;
</script>
</head>
<body>
</body>
</html>
(4)jsonp
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>jsonp</title>
<style type="text/css">
</style>
<!-- <script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script> -->
<script type="text/javascript">
// alert($);//function(a,b){return new n.fn.init(a,b)}
/*
jsonp可以跨域请求数据的原理：
主要是利用了script标签可以跨域链接资源的特性
*/
function aa(dat){
alert(dat.name);
}
</script>
<script type="text/javascript" src="js/data.js"></script>
</head>
<body>
</body>
</html>
(5)jQuery-jsonp
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>jQuery-jsonp</title>
<style type="text/css">
</style>
<script type="text/javascript" src="js/jquery-1.12.4.min.js"></script>
<script type="text/javascript">
$.ajax({
url: 'http://localhost:8080/1803/js/data.js',//跨域请求的地址，也可用相对路径js/data.js
type: 'get',
dataType: 'jsonp',//使用jsonp跨域请求
jsonpCallback:'aa'
})
.done(function(data) {
alert(data.name);
})
.fail(function() {
console.log("error");
});
</script>
</head>
<body>
</body>
</html>
(6)jsonp公开接口
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>jsonp公开接口</title>
<style type="text/css">
</style>
<script type="text/javascript" src="js/jquery-1.12.4.min.js"></script>
<script type="text/javascript">
//360搜索的公开接口
//https://sug.so.360.cn/suggest?callback=suggest_so&encodein=utf-8&encodeout=utf-8&format=json&fields=word&word=s
$(function(){
$('#txt01').keyup(function(){
var val = $(this).val();
$.ajax({
url: 'https://sug.so.360.cn/suggest?',//请求360搜索的公开接口
type: 'get',
dataType: 'jsonp',//跨域请求
data: {word: val}//携带参数
})
.done(function(data) {
console.log(data);
// alert(data.s.length);//10条数据
$('.list').empty();//先清空列表
//模拟搜索联想，循环插入新列表
for(var i=0; i<data.s.length; i++){
var $li = $('<li>'+data.s[i]+'</li>');
$li.prependTo('.list');
}
})
.fail(function() {
console.log("error");
});
})
})
</script>
</head>
<body>
<input type="text" id="txt01">
<ul class="list"></ul>
</body>
</html>
(7)
/*
NodeJS Static Http Server - http://github.com/thedigitalself/node-static-http-server/
By James Wanga - The Digital Self
Licensed under a Creative Commons Attribution 3.0 Unported License.
A simple, nodeJS, http development server that trivializes serving static files.
This server is HEAVILY based on work done by Ryan Florence(https://github.com/rpflorence) (https://gist.github.com/701407). I merged this code with suggestions on handling varied MIME types found at Stackoverflow (http://stackoverflow.com/questions/7268033/basic-static-file-server-in-nodejs).
To run the server simply place the server.js file in the root of your web application and issue the command
$ node server.js
or
$ node server.js 1234
with "1234" being a custom port number"
Your web application will be served at http://localhost:8888 by default or http://localhost:1234 with "1234" being the custom port you passed.
Mime Types:
You can add to the mimeTypes has to serve more file types.
Virtual Directories:
Add to the virtualDirectories hash if you have resources that are not children of the root directory
*/
var http = require("http"),
url = require("url"),
path = require("path"),
fs = require("fs")
port = process.argv[2] || 8888;
var mimeTypes = {
"htm": "text/html",
"html": "text/html",
"jpeg": "image/jpeg",
"jpg": "image/jpeg",
"png": "image/png",
"gif": "image/gif",
"js": "text/javascript",
"css": "text/css",
"json":"text/json",
"eot":"application/vnd.ms-fontobject",
"svg":"image/svg+xml",
"ttf":"application/octet-stream",
"woff":"application/font-woff",
"woff2":"application/font-woff"
};
var virtualDirectories = {
//"images": "../images/"
};
http.createServer(function(request, response) {
var uri = url.parse(request.url).pathname
, filename = path.join(process.cwd(), uri)
, root = uri.split("/")[1]
, virtualDirectory;
virtualDirectory = virtualDirectories[root];
if(virtualDirectory){
uri = uri.slice(root.length + 1, uri.length);
filename = path.join(virtualDirectory ,uri);
}
fs.exists(filename, function(exists) {
if(!exists) {
response.writeHead(404, {"Content-Type": "text/plain"});
response.write("404 Not Found\n");
response.end();
console.error('404: ' + filename);
return;
}
if (fs.statSync(filename).isDirectory()) filename += '/index.html';
fs.readFile(filename, "binary", function(err, file) {
if(err) {
response.writeHead(500, {"Content-Type": "text/plain"});
response.write(err + "\n");
response.end();
console.error('500: ' + filename);
return;
}
var mimeType = mimeTypes[path.extname(filename).split(".")[1]];
response.writeHead(200, {"Content-Type": mimeType});
response.write(file, "binary");
response.end();
console.log('200: ' + filename + ' as ' + mimeType);
});
});
}).listen(parseInt(port, 10));
console.log("Static file server running at\n => http://localhost:" + port + "/\nCTRL + C to shutdown");
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