📜  js 未定义或为空 - Javascript 代码示例

📅  最后修改于: 2022-03-11 15:03:09.233000             🧑  作者: Mango

代码示例3
var myVar=null;

if(myVar === null){
    //I am null;
}

if (typeof myVar === 'undefined'){
    //myVar is undefined
}