use of colon in javascript code example

Example 1: colon in js

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

Example 2: colon in js

switch (new Date().getDay()) {
    case 6:
        text = "Today is Saturday";
        break; 
    case 0:
        text = "Today is Sunday";
        break; 
    default: 
        text = "Looking forward to the Weekend";
}