JS judge whether the string is empty or not

1 Judge that the string is empty

var test="";
if(test==""||test==null||test==undefined){
    
  console.log(" It's empty ");// It's empty 
}

if(!test){
    
  console.log(" It's empty ");// It's empty 
}

2 Judgment string is not empty

var test="1";

if(test!=""&&test!=null&&test!=undefined){
    
  console.log(" Not empty ");// Not empty 
}

if(!!test){
    
  console.log(" Not empty ");// Not empty 
}