你即將離開本站

並前往https://www.codereadability.com/how-to-check-for-undefined-in-javascript/

How to check for undefined in JavaScript

In modern browsers you can safely compare the variable directly to undefined : if (name === undefined) {...} ... After that re-assignment, ...

確定！ 回上一頁

查詢 「javascript undefined」的人也找了：

  1. javascript undefined判斷
    2.
  2. JavaScript undefined to string
    3.
  3. JavaScript if undefined
    4.
  4. JavaScript undefined check
    5.
  5. JavaScript undefined null
    6.
  6. JavaScript object undefined check
    7.
  7. javascript
    8.
  8. javascript null判斷
    9.