📜  javascript 检查是否未定义或为空 - Javascript 代码示例
📅  最后修改于: 2022-03-11 15:04:23.188000             🧑  作者: Mango
代码示例4
var myVar=null;
if(myVar === null){
//I am null;
}
if (typeof myVar === 'undefined'){
//myVar is undefined
}