判斷 js 數組是否為 empty

function isEmpty(obj) {
    for(var key in obj) {
       if(obj.hasOwnProperty(key))
           return false;
       }
    return true;
}

var mycars = new Array();
mycars[0] = "";
mycars[1] = "";
mycars[2] = "";

console.log(isEmpty(mycars) ? '0' : '1'),

 

 

資料來源：

https://coderwall.com/p/_g3x9q/how-to-check-if-javascript-object-is-empty