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📜  检查javascript代码示例中的定义或未定义

📅  最后修改于: 2022-03-11 15:02:39.104000             🧑  作者: Mango

代码示例1
if (typeof variable !== 'undefined' || typeof variable ==='undefined') {
     //the variable is either defined or not defined 
       //in both conditions the code will be executed
}