Frontend

JS｜void

2023.04.26約 1 分鐘

語法

void expression

void 0;   // undefined
void(0);  // undefined

// 匿名函式
void function saySomething (msg) {
  console.log(msg);
} ('Hello');

saySomething('Hi'); // Uncaught ReferenceError: saySomething is not defined

void vs undefined undefined 並不是保留詞（reserved word）