superagent抓网站太快,怎么样实现延迟一段时间
const sa = require('superagent');
for(var i=1;i<100;i++){
var url="https://cnodejs.org/?page="+i;
console.log(url);
sa.get(url).set('Connection', 'keep-alive').end( (err,res) => {
console.log(res.body);
});
}