📜debugger

• JS ⟩ statement ⟩ other ⟩ debugger

• JS ⟩ debug ⟩ devtools ⟩ debugger

(statement)

• normally does nothing.

• if a debugger program is available and running (👉 see ⭐️ 重點), then it may perform some kind of debugging action.

• in practice, this statement acts like a breakpoint.

debugger    // acts like a breakpoint

⭐️ 重點

• it is not enough to have a debugger available.

• the debugger statement won’t start the debugger for you.

• if you’re using a web browser and have the devtools open, this statement will cause a breakpoint.

📗 參考

• JavaScript: The Definitive Guide ⟩ 5.6.2 debugger

📘 手冊

• debugger