console.log(a.b);console.log(c.d);var a = { b: 3};var c = { d: 8};書寫順序就是這樣，正常情況下應該是打印兩次undefind；但是，輸出卻是這樣：undefinedUncaught TypeError: Cannot read property 'd' of undefined
js執行報錯問題
楊__羊羊
2018-12-20 18:15:39
