A brief introduction to the Object type in js

This article brings you a brief introduction to the Object type in js. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Object type

Objects in ECMAScript are actually a collection of data and functions. Created via the new operator followed by the name of the object type to be created.

//创建一个Object对象
var  o = new Object();

Key:

The Object here is equivalent to the ancestor, and creating an instance of Object is of no use. It is like the java.lang.Object object in java.

Features:

Properties and methods common to each instance of the Object type:

Constructor: Saves the function used to create the current object.

hasOwnProperty: used to detect whether the given property exists in the instance of the current object.

isPrototypeOf: used to check whether the incoming object is the prototype of the current object

propertyIsEnumerble: used to check whether a given property can be enumerated using for-in

toLocaleString() : Returns the string representation of the object.

toString() : Returns the string representation of the object.

valueOf() : Returns the string, numerical value, or Boolean representation of the object. Usually the same value returned by toString().

Related recommendations:

Use js attributes to achieve the effect of horizontal drop-down menu in html5 (code)

Use template template engine in js An example of implementation (code)

The above is the detailed content of A brief introduction to the Object type in js. For more information, please follow other related articles on the PHP Chinese website!