How to add custom context menu list in SharePoint 2013?

In this below script,add custom context menu list in javascript

In this article ,We have create custom Context menu in SharePoint custom list ,

for single list(i.e. List Library) I have created a custom action for the content type.

 

1.Open SharePoint Designer.

2. Open SharePoint site

3. Go to that specific page and edit that page

4. Click on "Custom Action" in SharePoint  Designer and open "List item Menu"

 

5.Popup will be appear “Create Custom Action”.
6.Click Ok

 

 

7.Finally Created Custom Context menu.