Node编写API接口，ajax实现增删改查

首先展示一下预览效果以及文件结构:

一、预览效果:

信息列表：

编辑：

新增：

删除：

二、代码结构：

github代码下载地址： https://github.com/wyj2443573...

三、代码解析

(1)server.js 文件

代码（给出了相关注释如下）：

var http=require('http'),
    url=require('url'),
    fs=require('fs');
var server=http.createServer(function(req,res){
    let urlObj=url.parse(req.url,true),
        pathname=urlObj.pathname
        query=urlObj.query; //query 存储的是客户端请求的url地址中问号传参后面的信息
    //静态资源文件请求的处理
    let reg=/\.(html|css|js|ico)/i;
    if(reg.test(pathname)){
        let suffix=reg.exec(pathname)[1].toUpperCase();
        let suffixMIME='text/html';
        switch(suffix){
            case "CSS":
                suffixMIME='text/css';
                break;
            case "JS":
                suffixMIME='text/javascript';
                break;
        }
        try{
            let conFile=fs.readFileSync('.'+pathname,'utf-8');
            res.writeHead(200,{'content-type':suffixMIME+';charset=utf-8;'})
            res.end(conFile)
        }catch(e){
            res.writeHead(404,{'content-type':'text/plain;charset=utf-8;'})
            res.end('file is not found');
            return;
        }
    }
    //API数据接口的请求

    var con=null,
        result=null,
        customId=null,
        customPath='./json/customer.json';
    //首先把customer.json中的内容都获取到
    con=fs.readFileSync(customPath,'utf-8');
    con.length===0?con='[]':null;//为了防止我们custom.json中什么也没有，con也是一个空字符串，我们会使用JSON.parse转换的时候会报错
    con=JSON.parse(con);
    //1.获取所有的客户信息
    if(pathname==='/getList'){
        //开始按照API文章的规范给客户端返回的数据
        result={
            code:1,
            msg:'没有任何的客户信息',
            data:null
        };
        if(con.length>0){
            result={
                code:0,
                msg:'成功',
                data:con
            }
        }
        res.writeHead(200,{'content-type':'application/json;charset:utf-8'});
        res.end(JSON.stringify(result));
        return;
    }
    //2.获取具体某一个客户的信息根据客户id
    if(pathname==='/getInfo'){
        //把客户端传递进来的ID获取到
        customId=query['id'];
        result={
            code:1,
            msg:'客户不存在',
            data:null
        };
        for (var i = 0; i < con.length; i++){
            if(con[i]['id']==customId){
                con=con[i];
                result={
                    code:0,
                    msg:'成功',
                    data:con
                    }
                break;
                }
        }
        res.writeHead(200,{'content-type':'application/json;charset:utf-8'});
        res.end(JSON.stringify(result));
        return;
    }
    //3.根据id删除用户
    if(pathname==='/removeInfo'){
        customId=query["id"];
        var flag=false;
        for (var i = 0; i < con.length; i++) {
            if(con[i]['id']==customId){
                con.splice(i,1);
                flag=true;
                break;
            }
        }
        result={
            code:1,
            msg:'删除失败'
        }
        if(flag){
            fs.writeFileSync(customPath,JSON.stringify(con),'utf-8');
            result={
                code:0,
                msg:'删除成功'
            }
        }
        res.writeHead(200,{'content-type':'application/json;charset:utf-8'});
        res.end(JSON.stringify(result));
        return;
    }
    //4.增加客户信息
    if(pathname==='/addInfo'){
        //获取客户端通过请求主体传递进来的内容
        var str='';
        req.on("data",function(chunk){ //chunk实时传输的数据
            str+=chunk;
        })
        req.on("end",function(){ //接收数据完毕
            if(str.length===0){
                res.writeHead(200,{'content-type':'application/json;charset:utf-8'});
                res.end(JSON.stringify({
                    code:1,
                    msg:'增加失败,没有传递任何需要增加的信息'
                }));
                return;
            }
            var data=JSON.parse(str);
            //在现有的id中追加一个ID：获取con中最后一项的ID，ID+1=>新ID
            data['id']=con.length===0?1:parseInt(con[con.length-1]['id'])+1;
            con.push(data);
            fs.writeFileSync(customPath,JSON.stringify(con),'utf-8');
            res.writeHead(200,{'content-type':'application/json;charset:utf-8'});
            res.end(JSON.stringify({
                code:0,
                msg:'增加成功'
            }));
        });
        return;
    }
    //5.修改客户信息
    if(pathname==='/updateInfo'){
        var str='';
        req.on("data",function(chunk){
            str+=chunk;
        });
        req.on("end",function(){
            if(str.length===0){
                res.writeHead(200,{'content-type':'application/json;charset:utf-8'});
                res.end(JSON.stringify({
                    code:1,
                    msg:'修改失败，修改信息为空'
                }));
            }
            var data=JSON.parse(str);
            var flag=false;
            for (var i = 0; i < con.length; i++) {
                if(con[i]['id']==data['id']){
                    con[i]=data;
                    flag=true;
                    break;
                }
            }
            if(flag){
                fs.writeFileSync(customPath,JSON.stringify(con),'utf-8');
                res.writeHead(200,{'content-type':'application/json;charset:utf-8'});
                res.end(JSON.stringify({
                    code:0,
                    msg:'修改成功'
                }));

            }
        });
        return;
    }

    res.writeHead(404,{'content-type':'text/plain;charset=utf-8'});
    res.end(JSON.stringify({
        code:1,
        msg:'请求接口不存在'
    }))


    
})
server.listen(8082,function(){
    console.log('server is success, listening on 8082 port')
})

(2)index. html

主要是按照单例模式写相关事件绑定的方法。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>node撸接口</title>
    <link rel="stylesheet" href="css/index.css">
</head>
<body>
<div class="box" >
    <a class="addBtn" href="add.html">增加新用户</a>
    <h2 class="head">
        <span>编号</span>
        <span>姓名</span>
        <span>年龄</span>
        <span>地址</span>
        <span>操作</span>
    </h2>
    <ul class="list" id="list">

    </ul>

</div>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
<script>
    //获取客户信息，完成页面的数据绑定
    var customeModule=(function(){
        //Bind html
        var documentList=document.getElementById('list');
        function bindHtml(data){
            var str='';
            for (var i = 0; i < data.length; i++) {
                var curData=data[i];
                str+=`<li>
                        <span>${curData.id}</span>
                        <span>${curData.name}</span>
                        <span>${curData.age}</span>
                        <span>${curData.address}</span>
                        <span>
                            <a href="add.html?id=${curData.id}">修改</a>
                            <a href="javascript:;" cusId="${curData.id}">删除</a>
                        </span>
                     </li>`
            }
            documentList.innerHTML=str;
        }
        function removeCustomer(){
            documentList.onclick=function(e){
                var e=e||window.event,
                     tar= e.target|| e.srcElement,
                        tarTag=tar.tagName.toUpperCase();
                //删除操作
                if(tarTag==='A'&&tar.innerHTML==='删除'){
                //确认提示框
                    var customId=tar.getAttribute('cusId'),
                            flag=window.confirm('确定要删除编号为['+customId+']的客户吗?');
                    if(flag){
                        $.ajax({
                            url:'/removeInfo?id='+customId,
                            success:function(data){
                                if(data&&data.code==0){
                                    documentList.removeChild(tar.parentNode.parentNode);
                                    return;
                                }
                                alert(data.msg);
                            }
                        })
                    }

                }
            }
        }
        //send ajax get data
        function init(){
            $.ajax({
                url:'/getList',
                success:function(data){
                    console.log(data);
                   if(data&&data.code==0){
                       var data=data['data'];
                       //绑定数据
                       bindHtml(data);
                       //取消
                       removeCustomer();
                   }
                }
            })
        }
        return{
            init:init
        }
    })();
    customeModule.init();


</script>
</body>
</html>

(3)add.html

通过URL参数判断操作是增加客户信息还是编辑客户信息。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>增加用户</title>
    <link rel="stylesheet" href="css/index.css">
    <style>
        .box2{
            width:800px;
            margin:50px auto;
            font-family:Arial,"PingFang SC","Hiragino Sans GB",STHeiti,"Microsoft YaHei","WenQuanYi Micro Hei",sans-serif ;
            font-weight: 700;
            border:10px solid #dadada;
            text-align: center;
            padding:10px;
        }
        .box2 ul{
            width:100%;
            overflow: hidden;
        }
        .box2 ul li{
            width:100%;
            height:36px;
            float:left;
            padding:5px;
            text-align: center;
        }
        .box2 .type{
            display: inline-block;
            width:60px;
            height:36px;
            line-height: 36px;

        }
        .inputInfo{
            width:600px;
            padding:0 10px;
            height:36px;
            border:1px solid #ddd;
        }
        .submit{
            display: inline-block;
            margin:15px auto 0;
            width:100px;
            height:36px;
            background-color: #179a6e;
            cursor: pointer;
        }
    </style>
</head>
<body>
    <div class="box2">
        <ul>
            <li>
                <span class="type">姓名:</span>
                <input type="text"  id="userName" class="inputInfo">
            </li>
            <li>
                <span class="type" >年龄:</span>
                <input type="text" id="userAge" class="inputInfo">
            </li>
            <li>
                <span class="type" >地址:</span>
                <input type="text" class="inputInfo" id="userAddress">
            </li>
        </ul>
        <button class="submit" id="submit">提交</button>
    </div>
</body>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
<script>
    //    获取URL地址栏的参数值
    String.prototype.queryUrlParameter=function(){
        var obj={};
        var reg=/([^?=&#]+)=([^?=&#]+)/g;
        this.replace(reg,function(){
            var key=arguments[1];
            var value=arguments[2];
            obj[key]=value;
        })
        return obj;
    }
    var userName=document.getElementById('userName');
    var userAge=document.getElementById('userAge');
    var userAddress=document.getElementById('userAddress');
    var submit=document.getElementById('submit');
    //判断修改还是增加：如果url后面传递了ID值就是修改，否则就是增加
    var urlBoj= window.location.href.queryUrlParameter(),
            customId=urlBoj['id'],
            isFlag=typeof customId==='undefined'?false:true; //true->修改 false->增加
    //如果是修改，首先需要把对应客户的信息获取到，并且增加到对应的文本框中。
    if(isFlag){
        $.ajax({
            url:'/getInfo?id='+customId,
            success:function(data){
                if(data&&data.code==0){
                    var result=data['data'];
                    userName.value=result['name'];
                    userAge.value=result['age'];
                    userAddress.value=result['address'];
                }
            }
        })
    }
    //点击提交按钮1.增加2.修改
    submit.onclick=function(){
        var obj={
            name:userName.value,
            age:userAge.value,
            address:userAddress.value
        };
        //update send ajax
        if(isFlag){
            console.log('进入修改');
            obj.id=customId;
            $.ajax({
                url:'/updateInfo',
                type:'POST',
                data:JSON.stringify(obj),
                success:function(data){
                    if(data&&data.code==0){
                        window.location.href='index.html'
                        return;
                    }
                    alert(data.msg);
                }

            })
            return;
        }
        //add send ajax
        $.ajax({
            url:'/addInfo',
            type:'POST',
            data:JSON.stringify(obj), //请求主体的内容是json格式的字符串
            success:function(data){
                if(data&&data.code==0){
                    //成功后跳转回首页
                    window.location.href='index.html'
                }
                alert(data.msg);
            }
        });
    }
</script>
</html>

（4）customer.json

[{"name":"Tom","age":"20","address":"北京天通苑","id":"1"},{"name":"Tony","age":"23","address":"北京沙河","id":"2"}]

（5）index.css

*{
    margin:0;
    padding:0;

}
li{
    list-style: none;
}
.box{
    width:800px;
    margin:50px auto;
    font-family:Arial,"PingFang SC","Hiragino Sans GB",STHeiti,"Microsoft YaHei","WenQuanYi Micro Hei",sans-serif ;
    font-weight: 700;
    border:10px solid #dadada;
}
.addBtn{
    color:#179a6e;
    font-size:18px;

}
.head{
    width:100%;
    height:30px;
    font-size:16px;
    line-height:30px;
    background-color: #179a6e;
    overflow: hidden;
}
.head span{
    display: inline-block;
    float:left;
    width:20%;
    text-align: center;
    color:#fff;
    position: relative;
}
.head span:after{
    content:'';
    position:absolute;
    width:1px;
    height:30px;
    background-color: #fff;
    right:0;
    top:0;
}
.list{
    width:100%;

}
.list li{
    width:100%;
    height:36px;
    line-height: 36px;
    overflow: hidden;
    border-bottom:1px solid #ddd;
    cursor: pointer;
}
.list li:hover{
    background-color: #fafafa;
}
.list li span{
    display: inline-block;
    width:20%;
    float:left;
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space:nowrap;
}