Toast message in Lightning component

How to show toast in lightning record page by using force:showToast. Toast are the message box or you can say notification which developer can show according to action of the user.

ATTRIBUTES

1.  type :  The toast can be of 4 types
   •  info
   • success
   • warning
   • error
2.  key :  It specify the icon on the toast when type is not defined.
3. title : it specify the title of the toast
4. message :  It specifies the message to show the user
5. messageTemplate :  If we want to override the message which is specified in message attribute we can use this attribute along with messageTemplateData. 
6. messageTemplateData : To show the overridden message you must use this attribute.
7. duration : It specify the duration of toast to be show to user. After specified duration toast will automatically disappear.
8.  mode : It specify how the toast will disappear. In salesforce there are 3 types of mode.
   • dismissible :  Toast will disappear either by user action or on complete of specified duration.
   • pester :  Toast will disappear on complete of specified duration. Close button will not appear.
   • sticky :  Toast will disappear  by user action