is there any difference below?
controllers
async function get (ctx, next) {
const res = await models.test.get()
ctx.state.data = res.data
/******* ********/
ctx.body = res.data
await next()
}
module.exports = {
get
}routes
router.get("/", controllers.test.get, async (ctx, next) => {
await ctx.render("test", {
list: ctx.state.data.obj,
/******* ********/
list: ctx.body.obj,
})
})state is used to save data for middleware, while body is the final output
The recommended namespace for passing information through middleware and to your frontend views.
body remains the same as before, just talk about state .
Why is there state , because we have a lot of middleware to store some yesterday, such as login or permission verification, before that, we will report an error to a custom attribute of ctx , such as ctx.locals.isLogin , but we always have to write code like this
app.use(async ctx => {
ctx.locals = ctx.locals || {};
}); now officially provides ctx.state status data for error reporting middleware.
to render the page on the koa server, you can use ctx.state to pass the value
for example:
ctx.state.username = '';
ctx.render('', {
pageTitle: ''
});so that you can get the value on the .ejs page
<input id="username" autocomplete="off" name="username" value="<%= username %>" placeholder="">you can also get values in other rendering templates in different ways
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