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

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

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日期:2025-04-27
Possible Duplicate: Detecting an undefined object property in JavaScript How do I determine if variable is 'undefined' or 'null'. My code is as follows: EmpName = $("div#esd-names ... Exception safe check: "if (window.yourVarName) { }" Most likely you wan...看更多