The method for calculating the object length in javascript.

The method for calculating the object length in javascript.

Calculates the length of an object, that is, the number of Object Attributes. The details are as follows:

Method 1:Traverse an object through for in and use hasOwnProperty to determine whether it is an object's own enumerable property.

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); // The result is 2.

Method 2:Use Object. keys () to obtain an array composed of the enumerated attributes of an Object, and use length to obtain the Object length.

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

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