📜  javascript 检查 undefined 或 null - Javascript 代码示例
📅  最后修改于: 2022-03-11 15:03:35.737000             🧑  作者: Mango
代码示例5
var myVar=null;
if(myVar === null){
//I am null;
}
if (typeof myVar === 'undefined'){
//myVar is undefined
}