Page View 改名叫 Container Loaded
The data layer是什麼？
一種拿來精製、客製化表達事件的物件，使用dataLayer來和GTM溝通，
告訴他：「欸我做了ｘｘｘ喔！」
另外記得dataLayer要寫在GTM的TAG上面
Pageview Trigger not working in GTM? Here’s How You Can Fix It
介紹dataLayer的寫法
Using a Data Layer
The Beginners Guide to Google Tag Manager
jellyfish
How to track iframes with Google Tag Manager
這篇建議用postMessage
charmaine-kruger
Tracking in an iFrame using Google Tag Manager
這篇也建議用postMessage
qaror
Track User Interactions in Iframe with Google Tag Manager
這篇也說用postMessage
MeasureSchool 影片
How to track iFrames with Google Tag Manager
這篇也說用postMessage，而且他用不同的GTM帳號又嵌在iframe裡
他用了一個trigger，連結他html裡的form的id
MeasureSchool
Tracking Iframes: How to Track Conversions in Iframes with Google Tag Manager
還沒看
MeasureLab
GTM Solutions Corner #2: How to track clicks on an iframe using GTM
待閱
jsndesign
iFrame Video Interactions Tracking with jQuery and Google Tag Manager
待閱
QQ擷圖：ctrl + alt + A
windows擷圖：windows + shift + S
包含字串的判斷
(Built-in) way in JavaScript to check if a string is a valid number
這篇有用到 num.trim() !== ”
Only numbers. Input number in React
https://jsfiddle.net/emkey08/zgvtjc51