js学习总结----案例分页之服务器内容和数据的处理

server.js文件如下

var http = require('http'),
    url = require('url'),
    fs = require('fs');
var server = http.createServer(function(req,res){
    var urlObj = url.parse(req.url,true),
        pathname = urlObj["pathname"],
        query = urlObj["query"];
    //静态资源(项目)文件的请求处理:服务端接收到具体的请求文件后把文件中的源代码返回给客户端进行渲染即可
    var reg = /.(HTML|CSS|JS)/i;
    if(reg.test(pathname)){
        var suffix = reg.exec(pathname)[1].toUpperCase(),
            suffixMIME = suffix==="HTML"?"text/html":(suffix==="CSS"?"text/css":"text/javascript");
        try{
            res.writeHead(200,{'content-type':suffixMIME+';charset=utf-8;'})
            res.end(fs.readFileSync("."+pathname,"utf-8"))
        }catch(e){
            res.writeHead(404);
            res.end("file is not found");
        }

    }

    //API接口文档中规定的数据请求处理
    var data = JSON.parse(fs.readFileSync("./json/student.json","utf-8"));
    if(pathname==="/getList"){
        var n = query["n"],
            ary = [];
        for(var i = (n-1)*10;i<=n*10-1;i++){
            //通过规律计算的索引比最大的索引都要大，直接的跳出即可，不需要在存储了（说明是最后一页了）
            if(i>data.length-1){
                break;
            }
            ary.push(data[i])
        }
        res.writeHead(200,{'content-type':'application/json;charset=utf-8;'})
        res.end(JSON.stringify({
            code:0,
            msg:"成功",
            total:Math.ceil(data.length/10),
            data:ary
        }))
        return;

    }

    if(pathname==="/getInfo"){
        var studentId = query["id"],
            obj = null;
        for(var i = 0;i<data.length;i++){
            if(data[i]["id"]==studentId){
                console.log(data[i]);
                obj = data[i];

            }
        }
        var result = {
            code:1,
            msg:"内容不存在！",
            data:null
        }
        if(obj){
            result = {
                code:0,
                msg:"成功",
                data:obj
            }
        }
        res.writeHead(200,{'content-type':'application/json;charset=utf-8;'})
        res.end(JSON.stringify(result));
        return;

    }
    //请求的接口地址不存在
    res.writeHead(404)
    res.end("request api url is not found");
})

server.listen(88,function(){
    console.log("server is success,listening on 88 port");
})