90node.js案例--前后台交互
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本案例包含4部分：（1）html部分；（2）ajax部分；（3）javascript部分；（4）node服务器部分。另外，因为牵涉到服务器，所以这里没法“效果预览”。
执行过程为：（1）在浏览器地址栏输入网址，向node服务器发送HTML请求；服务器接到请求后，返回一个HTML文件给客户端；
（2）客户端浏览器对HTML进行渲染，遇到<script>标签后，再次向服务器请求，服务器响应一个JavaScript文件给客户端，
（3）客户端浏览器对JavaScript文件进行渲染，渲染过程中，如果遇到ajax请求，客户端还会向服务器进行请求，服务器仍然会响应浏览器。
（4）最后，浏览器把渲染好的网页呈现在浏览者面前。
1、HTML部分：
```html:run
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>客户管理系统</title>
</head>
<body>
<div class="box">
<a href="javascript:void(0);" class="link">NEW CUSTOMER</a>
<h2>
<span class="fir">ID</span>
<span>NAME</span>
<span class="fir">AGE</span>
<span>PHONE</span>
<span>ADDRESS</span>
<span>CONTROL</span>
</h2>
<ul id="conList">
<li>
<span class="fir">1</span>
<span>钱成</span>
<span class="fir">25</span>
<span>13044086186</span>
<span>Bei Jing</span>
<span class="control">
<a href="javascript:void(0);">修改</a>
<a href="javascript:void(0);">删除</a>
</span>
</li>
</ul>
</div>
<script charset="utf-8" type="text/javascript" src="js/ajax.js"></script>
<script charset="utf-8" type="text/javascript" src="js/index.js"></script>
</body>
</html>
```
2、ajax部分：
**html 代码**
```html:run
~function ()
//->createXHR:创建AJAX对象,兼容所有的浏览器
function createXHR()
var xhr = null,
flag = false,
ary = [
function ()
return new XMLHttpRequest;
,
function ()
return new ActiveXObject("Microsoft.XMLHTTP");
,
function ()
return new ActiveXObject("Msxml2.XMLHTTP");
,
function ()
return new ActiveXObject("Msxml3.XMLHTTP");
];
for (var i = 0, len = ary.length; i < len; i++)
var curFn = ary[i];
try
xhr = curFn();
createXHR = curFn;
flag = true;
break;
catch (e)
if (!flag)
throw new Error("your browser is not support ajax,please change your browser,try again!");
return xhr;
//->ajax:实现AJAX请求的公共方法;
function ajax(options)
var _default =
url: "",
type: "get",
dataType: "json",
async: true,
data: null,
getHead: null,
success: null
;
for (var key in options)
if (options.hasOwnProperty(key))
_default[key] = options[key];
if (_default.type === "get")
_default.url.indexOf("?") >= 0 ? _default.url += "&" : _default.url += "?";
_default.url += "_=" + Math.random();
//->SEND AJAX
var xhr = createXHR();
xhr.open(_default.type, _default.url, _default.async);
xhr.onreadystatechange = function ()
if (/^2\d2$/.test(xhr.status))
if (xhr.readyState === 2)
if (typeof _default.getHead === "function")
_default.getHead.call(xhr);
if (xhr.readyState === 4)
var val = xhr.responseText;
if (_default.dataType === "json")
val = "JSON" in window ? JSON.parse(val) : eval("(" + val + ")");
_default.success && _default.success.call(xhr, val);
;
xhr.send(_default.data);
window.ajax = ajax;
();
```
3、JavaScript部分：
**html 代码**
```html:run
var customer = (function ()
var conList = document.getElementById(‘conList‘);
function bindEvent()
conList.onclick = function (ev)
ev = ev || window.event;
var tar = ev.target || ev.srcElement,
tarTag = tar.tagName.toUpperCase(),
tarInn = tar.innerHTML;
if (tarTag === ‘A‘ && tarInn === ‘删除‘)
//->ALERT、CONFIRM、PROMPT
var cusId = tar.getAttribute(‘data-id‘),
flag = window.confirm(‘确定要删除编号为 [ ‘ + cusId + ‘ ] 的客户吗?‘);
if (flag) //->点击的是确定按钮:调取对应的API接口实现删除即可
ajax(
url: ‘/removeInfo?id=‘ + cusId,
cache: false,
success: function (result)
if (result && result.code == 0)
//->删除成功后在HTML结构中移除对应的LI标签
conList.removeChild(tar.parentNode.parentNode);
);
function bindHTML(data)
var str = ‘‘;
for (var i = 0; i < data.length; i++)
var cur = data[i];
str += ‘<li>‘;
str += ‘<span class="fir">‘ + cur.id + ‘</span>‘;
str += ‘<span>‘ + cur.name + ‘</span>‘;
str += ‘<span class="fir">‘ + cur.age + ‘</span>‘;
str += ‘<span>‘ + cur.phone + ‘</span>‘;
str += ‘<span>‘ + cur.address + ‘</span>‘;
str += ‘<span class="control">‘;
str += ‘<a href="add.html?id=‘ + cur.id + ‘">修改</a>‘;
str += ‘<a href="javascript:;" data-id="‘ + cur.id + ‘">删除</a>‘;
str += ‘</span>‘;
str += ‘</li>‘;
conList.innerHTML = str;
return
init: function ()
ajax(
url: ‘/getAllList‘,
type: ‘GET‘,
dataType: ‘JSON‘,
cache: false,
success: function (result)
if (result && result.code == 0)
bindHTML(result.data);
bindEvent();
);
)();
customer.init();
```
4、node服务器部分：
**html 代码**
```html:run
var http = require("http");
var url = require("url");
var fs = require("fs");
var server1 = http.createServer(function (request, response)
var urlObj = url.parse(request.url, true);
var pathname = urlObj.pathname;
var query = urlObj.query;
var reg = /\.(HTML|CSS|JS|ICO)/i;
if (reg.test(pathname))
var suffix = reg.exec(pathname)[1].toUpperCase();
var suffixMIME = suffix === ‘HTML‘ ? ‘text/html‘ : (suffix === ‘CSS‘ ? ‘text/css‘ : ‘text/javascript‘);
try
var conFile = fs.readFileSync(‘.‘ + pathname, ‘utf-8‘);
response.writeHead(200, ‘content-type‘: suffixMIME + ‘;charset=utf-8;‘);
response.end(conFile);
//以conFile结束向客户端的响应，即给客户端返回./index.html的全部代码，供客户端渲染成页面。
catch (e)
response.writeHead(404, ‘content-type‘: ‘text/plain;charset=utf-8;‘);
response.end(‘request file is not found!‘);
return;
//->数据API请求处理:客户端的JS代码中我们通过AJAX向服务器发送的请求,服务器接收到请求并且
// 获取客户端传递的数据,把需要的数据内容准备好,然后在返回给客户端,客户端在AJAX的READY
// STATE等于4的时候获取返回的内容(都是按照API的规范文档来处理)
var customData = fs.readFileSync(‘./json/custom.json‘, ‘utf-8‘);
customData.length === 0 ? customData = ‘[]‘ : null;
customData = JSON.parse(customData);
var result =
code: 1,
msg: ‘失败‘,
data: null
;
var customId = null;
//1)获取所有的客户信息
if (pathname === ‘/getAllList‘)
if (customData.length > 0)
result =
code: 0,
msg: ‘成功‘,
data: customData
;
response.writeHead(200, ‘content-type‘: ‘application/json;charset=utf-8;‘);
response.end(JSON.stringify(result));
return;
//2)获取指定的客户信息
if (pathname === ‘/getInfo‘)
customId = query[‘id‘];
customData.forEach(function (item, index)
if (item[‘id‘] == customId)
result =
code: 0,
msg: ‘成功‘,
data: item
;
);
response.writeHead(200, ‘content-type‘: ‘application/json;charset=utf-8;‘);
response.end(JSON.stringify(result));
return;
//3)增加客户信息
if (pathname === ‘/addInfo‘)
var str = ‘‘;
request.on(‘data‘, function (chunk)
str += chunk;
);
request.on(‘end‘, function ()
var data = JSON.parse(str);
data[‘id‘] = customData.length === 0 ? 1 : parseFloat(customData[customData.length - 1][‘id‘]) + 1;
customData.push(data);
fs.writeFileSync(‘./json/custom.json‘, JSON.stringify(customData), ‘utf-8‘);
result =
code: 0,
msg: ‘成功‘
;
response.writeHead(200, ‘content-type‘: ‘application/json;charset=utf-8;‘);
response.end(JSON.stringify(result));
);
return;
//4)修改客户信息
if (pathname === ‘/updateInfo‘)
str = ‘‘;
request.on(‘data‘, function (chunk)
str += chunk;
);
request.on(‘end‘, function ()
var data = JSON.parse(str),
flag = false;
for (var i = 0; i < customData.length; i++)
if (data[‘id‘] == customData[i][‘id‘])
customData[i] = data;
flag = true;
break;
if (flag)
fs.writeFileSync(‘./json/custom.json‘, JSON.stringify(customData), ‘utf-8‘);
result =
code: 0,
msg: ‘成功‘
;
response.writeHead(200, ‘content-type‘: ‘application/json;charset=utf-8;‘);
response.end(JSON.stringify(result));
);
return;
//5)删除客户信息
if (pathname === ‘/removeInfo‘)
customId = query[‘id‘];
var flag = false;
customData.forEach(function (item, index)
if (item[‘id‘] == customId)
customData.splice(index, 1);
flag = true;
);
if (flag)
fs.writeFileSync(‘./json/custom.json‘, JSON.stringify(customData), ‘utf-8‘);
result =
code: 0,
msg: ‘成功‘
;
response.writeHead(200, ‘content-type‘: ‘application/json;charset=utf-8;‘);
response.end(JSON.stringify(result));
return;
response.writeHead(404, ‘content-type‘: ‘text/plain;charset=utf-8;‘);
response.end(‘request url is not found!‘);
);
server1.listen(80, function ()
console.log("server is success,listening on 80 port!");
);
```
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