koa2-cors 應用:
用於設置允許跨域
案例:
後臺代碼
const Koa = require('koa');
const Cors = require('koa2-cors');
const App = new Koa()
App.use(Cors());
App.use((ctx)=>{
if(ctx.url == '/'){
ctx.body = "home"
}
});
App.listen(3000,function () {
console.log('quick start at port 3000')
})
前端鏈接:http://localhost:63342/test2.html 及代碼:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>測試renderApi</title>
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
</head>
<body>
<a href="test.html">test</a>
<script>
window.onload = function () {
axios({
method: 'get',
url: 'http://localhost:3000/',
}).then(res=>{
console.log(res)
}).catch(err=>{
console.log(err)
})
}
</script>
</body>
</html>
當我們訪問http://localhost:63342/test2.html 後請求成功返回結果