How to calculate object length in javascript

This article mainly introduces the method of calculating object length in JavaScript in detail. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

Calculate the length of the object, that is, get the number of object properties, as follows

Method 1:Traverse the object through for in, and determine whether it is through hasOwnProperty It is the enumerable property of the object itself

var obj = {"c1":1,"c2":2};
function countProperties(obj){
  for(var property in obj){
    if(Object.prototype.hasOwnProperty.call(obj,property){
      count++;
    })
  }
  return count;
}
var len = obj.length;
console.log(len);//结果为2

Method 2: Get the object’s enumerable properties through Object.keys() array, and get the length of the object through length

var obj = {"c1":1,"c2":2};
var arr = Object.keys(obj);
var len = arr.length;
console.log(len);//结果为2

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