How to calculate the length of the obtained object in JS

This time I will show you how to calculate and obtain the length of object with JS. What are the precautions for calculating and obtaining the length of object with JS. The following is a practical case. Let’s take a look. take a look.

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

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

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 array composed of the enumerable attributes of the object through Object.keys(), 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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