wellcome page

上面的--- a/index.html表示的是比較舊的版本，+++ b/index.html是比較新的版本

下面列的是檔案內容的比對

+開頭的表示新加的行

-開頭的表示被刪除的行

空白的表示沒有改變的行

官網列的文件：

git diff [options] [<commit>] [--] [<path>…​]
git diff [options] --cached [<commit>] [--] [<path>…​]
git diff [options] <commit> <commit> [--] [<path>…​]
git diff [options] <blob> <blob>
git diff [options] [--no-index] [--] <path> <path>
git diff
比對的是現在的工作區跟index的差異
git diff --cached []
比對index與指定commit的差異
git diff [options]  
指定的兩個commit的差異
git diff [options]  
比對兩個blob物件的差異
Git裡的物件可以參考這裡
git diff --no-index  
比對兩個path下的差異，我比對後出現很多看不懂的比對結果
可以透過git diff 來比對出兩個路徑或是版本的差異
可以參考git diff document