取得 Slack Incoming WebHooks

需要取得 Webhook URL 才能做後續的送值，詳細的步驟可以參考 incoming-webhooks

到 Incoming WebHooks 頁後點選 Add Configuration 會看到這畫面

其中的 Webhook URL 就是我們需要的，格式會像這樣https://hooks.slack.com/services/T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX

接著結合上一章學到的 URL Fetch Service 試著丟點資料過去

function SlackIncomingWebHooks() {
  var webHookUrl = 'https://hooks.slack.com/services/T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX';
  var params = {
    method: 'POST',
    payload: JSON.stringify({
      channel: "#general",
      username: "熊俠",
      icon_url: "https://ithelp.ithome.com.tw/storage/image/ironman9theditor.png",
      text: "有人發了新文章啦~",
      attachments:[{
        color: "#00a0e9",
        fields: [{
          title: "標題",
          value: "<https://ithelp.ithome.com.tw/articles/10193412/|和 Slack 的初次交流>",
          short: true
        }, {
          title: "作者",
          value: "培根",
          short: true
        }]
      }]
    })
  };
  UrlFetchApp.fetch(webHookUrl, params);
}

如果在 Slack 看到這樣的訊息就代表成功啦～