javascript - How to determine if variable is 'undefined' or 'null ...

javascript - How to determine if variable is 'undefined' or 'null ...

瀏覽:790
日期:2025-06-12
2010年4月15日 - Possible Duplicate: Detecting an undefined object property in ... You can do like this: if(typeof variable_here === 'undefined'){ // your code here. };....看更多