javascript when to use colon code example

Example 1: colon in js

List: 
while(counter < 50)
{
     userInput += userInput;
     counter++;
     if(userInput > 10000)
     {
          break List;
     }
}

Example 2: colon in js

var Car = {model:"2015", color:"blue"}; //car object with model and color properties