这个app可以说是自己弄着玩的。
效果这样:
随机返回800多个三国武将里面的5个,然后按照这5个的武力值排序,渲染到list页面。挺好玩的。
使用nodejs和mogoose
app如下:
app.js
var createError = require("http-errors");
var express = require("express");
var path = require("path");
var cookieParser = require("cookie-parser");
var logger = require("morgan");
const template = require("art-template");
var indexRouter = require("./routes/index");
var usersRouter = require("./routes/users");
var listRouter = require("./routes/list");
var testRouter = require("./routes/test");
var app = express();
// view engine setup
app.set("views", path.join(__dirname, "views"));
app.set("view engine", "html");
app.engine("html", require("express-art-template"));
app.set("view engine", "art");
app.engine("art", require("express-art-template"));
app.locals.students = [
{ name: "张三", age: 20, sex: "女", like: "python" },
{ name: "李四", age: 20, sex: "男", like: "node" },
];
app.use(logger("dev"));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, "public")));
app.use("/", indexRouter);
app.use("/users", usersRouter);
app.use("/list", listRouter);
app.use("/test", testRouter);
// catch 404 and forward to error handler
app.use(function (req, res, next) {
next(createError(404));
});
// error handler
app.use(function (err, req, res, next) {
// set locals, only providing error in development
res.locals.message = err.message;
res.locals.error = req.app.get("env") === "development" ? err : {};
// render the error page
console.log("THERE IS AN ERROR");
// res.status(err.status || 500);
// res.render("error");
});
app.listen(3000, function () {
console.log("servie runing 3000");
});
// module.exports = app;
这里定义了list的路由,listRouter如下:
var express = require("express");
var router = express.Router();
var Sanguo = require("../model/db");
/* GET home page. */
router.get("/", async function (req, res) {
// res.send("ok");
// console.log(students);
// return;
var random = Math.round(Math.random() * 700);
console.log(random);
let results = await Sanguo.find().limit(5).skip(random).exec();
// res.send({ students: results });
// results.exec(function (err, results) {
console.log(results);
let arrayHero = [];
for (var i = 0; i < results.length; i++) {
// console.log("****************");
// hero = results[i].toString();
// console.log("hero");
// console.log(x);
x = JSON.parse(JSON.stringify(results[i]));
// console.log(JSON.parse(JSON.stringify(results[i])));
arrayHero.push(x);
// console.log("****************");
}
// return;
let heroList = arrayHero.sort(compare("wuLi", true));
res.render("list.html", { students: arrayHero });
// });
// for (let index = 0; index < results.length; index++) {
// const element = results[index];
// console.log(element.name);
// }
// return;
// let heros = JSON.parse(results);
// console.log(results);
// // res.send(results);
// res.render("list.html", { heros: heros });
});
/** 两个参数: 参数1 是排序用的字段, 参数2 是:是否升序排序 true 为升序,false为降序*/
function compare(attr, rev) {
// console.log(attr, rev)
if (rev == undefined) {
rev = 1;
} else {
rev = rev ? 1 : -1;
}
return (a, b) => {
a = a[attr];
b = b[attr];
if (a < b) {
return rev * -1;
}
if (a > b) {
return rev * 1;
}
return 0;
};
}
module.exports = router;
首先把三国的表引入,在model下面的db里面定义好的,然后,查询武将,
查询之前,使用random,随机生成700以内的数字,这些数字,可以作为find的参数,skip,
返回的结果,之后,把结果存入一个数组,
数组是arrayHero。这里在保存数组的过程中,要先JSON转变字符串,在用json解析,这样不会因为mongoose返回的object,第一个的_id字段无法解析。
渲染模板的过程中,还需要对武力值排序,这个是从网上搜集到的一个数组,按照某一个键排序的函数。直接抄过来的。
最后的db.js
var mongoose = require("mongoose");
mongoose.connect("mongodb://localhost/test").then(console.log("链接陈功"));
var sanguoSchema = new mongoose.Schema({});
var Sanguo = mongoose.model("Sanguo", sanguoSchema);
module.exports = Sanguo;
ok,每次刷新页面就会随机挑出5个武将。