JS to determine if it is an empty object

Main ideas

We have to consider the main: JS native object, the host object (above the browser).

First, for the host object

The main judgment is that the DOM object and whether it is a Window object

Whether the DOM object Value.nodetype exists.

is the Window object, value! = NULL && value = = = Value.window;

For both of these are definitely not empty objects.

if (Value.nodetype | | IsWindow (value)) {return false;}

For JS native objects

Whether or not the return is false for itself to return false has ' false ', ' null ', ' "', ' ' undefined ', ' NaN ', ' 0 ' in this 6 case

These obviously cannot be empty objects.

Then determine whether an object is using Object.prototype.toString.call (value) = = = ' [Object Object] '; Abbreviation for IsObject

There is also a judgment to determine whether you have a Hasownprototype method.

if (!value | |!isobject (value) | |!value.hasownprototype) {return false;}

If none of these conditions are met,

You need to handle whether you have your own properties,

for (var key in value) {if (Value.hasownprototype (key)) {return false; }}

Full code:

function Isemptyobject (value) {if (Value.nodetype | | IsWindow (value)) {return false;    } if (!value | |!isobject (value) | |!value.hasownprototype) {return false;        } for (var key in value) {if (Value.hasownprototype (key)) {return false; }} return true;

JS to determine if it is an empty object