JavaScript method to calculate object length

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 the object itself through hasOwnProperty Enumerable properties

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 object length 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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