原生node.js案例--前后臺交互

更新時間：2017年02月20日 14:05:29 作者：前端工程師_錢成

本文主要介紹了原生node.js案例--前后臺交互。本案例包含4部分：（1）HTML部分；（2）ajax部分；（3）JavaScript部分；（4）node服務器部分。具有很好的參考價值，下面跟著小編一起來看下吧

本案例包含4部分：（1）HTML部分；（2）ajax部分；（3）JavaScript部分；（4）node服務器部分。另外，因為牽涉到服務器，所以這里沒法“效果預覽”。

執(zhí)行過程為：

（1）在瀏覽器地址欄輸入網址，向node服務器發(fā)送HTML請求；服務器接到請求后，返回一個HTML文件給客戶端；

（2）客戶端瀏覽器對HTML進行渲染，遇到<script>標簽后，再次向服務器請求，服務器響應一個JavaScript文件給客戶端，

（3）客戶端瀏覽器對JavaScript文件進行渲染，渲染過程中，如果遇到ajax請求，客戶端還會向服務器進行請求，服務器仍然會響應瀏覽器。

（4）最后，瀏覽器把渲染好的網頁呈現(xiàn)在瀏覽者面前。

1、HTML部分：

<!DOCTYPE html>
<html>
<head>
 <meta charset="UTF-8">
 <title>客戶管理系統(tǒng)</title>
</head>
<body>
<div class="box">
 <a href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" 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>錢成</span>
   <span class="fir">25</span>
   <span>13044086186</span>
   <span>Bei Jing</span>
   <span class="control">
    <a href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" >修改</a>
    <a href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" >刪除</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：

~function () {
 //->createXHR:創(chuàng)建AJAX對象,兼容所有的瀏覽器
 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:實現(xiàn)AJAX請求的公共方法;
 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 === '刪除') {
    //->ALERT、CONFIRM、PROMPT
    var cusId = tar.getAttribute('data-id'),
     flag = window.confirm('確定要刪除編號為 [ ' + cusId + ' ] 的客戶嗎?');
    if (flag) {//->點擊的是確定按鈕:調取對應的API接口實現(xiàn)刪除即可
     ajax({
      url: '/removeInfo?id=' + cusId,
      cache: false,
      success: function (result) {
       if (result && result.code == 0) {
        //->刪除成功后在HTML結構中移除對應的LI標簽
        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 + '" rel="external nofollow" >修改</a>';
   str += '<a href="javascript:;" rel="external nofollow" data-id="' + cur.id + '">刪除</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服務器部分：

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結束向客戶端的響應，即給客戶端返回./index.html的全部代碼，供客戶端渲染成頁面。
  } catch (e) {
   response.writeHead(404, {'content-type': 'text/plain;charset=utf-8;'});
   response.end('request file is not found!');
  }
  return;
 }
 //->數(shù)據(jù)API請求處理:客戶端的JS代碼中我們通過AJAX向服務器發(fā)送的請求,服務器接收到請求并且
 // 獲取客戶端傳遞的數(shù)據(jù),把需要的數(shù)據(jù)內容準備好,然后在返回給客戶端,客戶端在AJAX的READY
 // STATE等于4的時候獲取返回的內容(都是按照API的規(guī)范文檔來處理)
 var customData = fs.readFileSync('./json/custom.json', 'utf-8');
 customData.length === 0 ? customData = '[]' : null;
 customData = JSON.parse(customData);
 var result = {
  code: 1,
  msg: '失敗',
  data: null
 };
 var customId = null;
 //1)獲取所有的客戶信息
 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)獲取指定的客戶信息
 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)增加客戶信息
 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)修改客戶信息
 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)刪除客戶信息
 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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