Koa 用的都是中间键,而这些中间键的顺序是压栈.例如:
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| let koa = require('koa');
let app = new koa();
app.use((ctx, next) => {
console.log(1)
next();
console.log(5)
});
app.use((ctx, next) => {
console.log(2)
next();
console.log(4)
});
app.use((ctx, next) => {
console.log(3)
ctx.body = 'Hello World';
});
app.listen(3000);
|
这里console.log(3)以后会去取最新入栈的 console.log(4), 而不是5