jQuery is () function

/ * * Definition and Usage: 
  * IS () method for a user to view the selected element is equipped with a selector. 
  * Remarks: 
  * The parent element tag judgment <p> tag whether the <div> tag. 
  * If you are prompted! 
  * / 
IF ($ ( "p") parent () IS ( "div.". )) { 
    Alert ( "parent element is p div" ); 
}