twitterのDMグループにユーザーをまとめて追加する奴

add_user.js

getElementsByXPath = function(expression, parentElement) {
    var r = []
    var x = document.evaluate(expression, parentElement || document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null)
    for (var i = 0, l = x.snapshotLength; i < l; i++) {
        r.push(x.snapshotItem(i))
    }
    return r
}

//ここにユーザーネームを追加する
usernames = ["@oqoobo","@145pokpok","@test","@test2","@gigazine"];
//追加できなかったユーザーネームの一覧
failed_names = [];

for(username of usernames)
{
	var element = document.querySelector('input[placeholder="ユーザーを検索"]');
	element.value= username;
	element = getElementsByXPath('//form[@aria-label="ユーザーを検索"]//span[text()="'+ username + '"]');
	if(element.length == 0)
		failed_names.push(username);
	else
		element[0].click();
}
alert("add usernames. It print usernames which failed to add in console");
console.log(failed_names);