直接看這篇
this 代表的是 function 執行時所屬的物件，而不是 function 本身。
每個執行環境都有屬於自己的this關鍵字（自然產生）
this與函式如何宣告沒有關聯性，僅與呼叫方法有關
嚴格模式下，簡易呼叫會有很大的改變
截圖 2024-06-07 下午4.27.08
百分之95的this指向都是以上（如果前面有物件就指向物件，沒有就指向全域
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