原生node.js案例--前后台交互

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

2、ajax部分：

~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\d{2}$/.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：

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 += '
';
   str += '' + cur.id + '';
   str += '' + cur.name + '';
   str += '' + cur.age + '';
   str += '' + cur.phone + '';
   str += '' + cur.address + '';
   str += '';
   str += '修改';
   str += '删除';
   str += '';
   str += '
';
  }
  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：

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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