node6------async-await
async\await只有ES7对应的node6之后的版本支持，如果node6、ES6支持这种需要添加对应babel支持
解决nodejs不支持async和await关键字的问题
1、$ npm install --save-dev babel-cli
2、$ npm install --save-dev babel-preset-es2015 babel-preset-es2017
3、Create .babelrc in the project root folder with the following contents:
{
"presets": ["es2015","es2017"]
}
4、Run your script with babel-node
$ babel-node async.js
package.json 文件
{ "name": "testop", "version": "1.0.0", "description": "", "main": "index.js", "scripts": { "test": "echo "Error: no test specified" && exit 1", "start": "babel-node app.js" }, "author": "", "license": "ISC", "dependencies": { "koa": "^2.5.1", "koa-bodyparser": "^2.5.0", "koa-router": "^7.4.0" }, "devDependencies": { "babel-cli": "^6.26.0", "babel-preset-es2015": "^6.24.1", "babel-preset-es2017": "^6.24.1" } }
app.js 文件
const Koa = require('koa'); const router = require('koa-router')(); const bodyParser = require('koa-bodyparser'); //使用post提交数据时，解析ctx.request.body的对应数据
// 创建一个Koa对象表示web app本身:
const app = new Koa();
app.use(bodyParser());
app.use(async (ctx, next) => {
console.log("22222");
await next();
});
app.use(async (ctx,next)=>{
console.log(${ctx.request.method} ${ctx.req} ${ctx.request.url} ${ctx.request.path});
if(ctx.request.path==="/no"){
ctx.response.type = 'text/html';
ctx.response.body = '
no found!
'; ctx.response.status=404; }else{ await next(); } }); // 对于任何请求，app将调用该异步函数处理请求： app.use(async (ctx, next) => { if(ctx.request.path==="/"){ ctx.response.type = 'text/html'; ctx.response.body = 'Hello, koa2!
'; ctx.response.status=200; }else{ await next(); } }); router.get("/login",function(ctx,next){ ctx.response.body =<h1>Index</h1> <form action="/signin" method="post"> <p>Name: <input name="name" value="koa"></p> <p>Password: <input name="password" type="password"></p> <p><input type="submit" value="Submit"></p> </form>;
});
router.post("/signin",function (ctx,next) {
console.log(ctx.request.body);
var name = ctx.request.body.name || '',
password = ctx.request.body.password || '';
console.log(signin with name: ${name}, password: ${password});
if (name === 'koa' && password === '12345') {
ctx.response.body = <h1>Welcome, ${name}!</h1>;
} else {
ctx.response.body = <h1>Login failed!</h1> <p><a href="/">Try again</a></p>;
}
})
router.get("/index/:name",function(ctx,next){ // ctx.throw(400,"no found"); ctx.response.type="text/html"; ctx.response.body="
Hello,index"+ctx.params.name+"!!
"; });app.use(router.routes());
// 在端口3000监听: app.listen(3000); console.log('app started at port 3000...');
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