How do I test if one array is a subset of another?

What's the best (cleanest) way to provide this sort of logic?

var colors = ["red","white","blue"];

logic(colors,["red","green"]); //false
logic(colors,["red"]); //true
logic(colors,["red","purple"]); //false
logic(colors,["red","white"]); //true
logic(colors,["red","white","blue"]); //true
logic(colors,["red","white","blue","green"]); //false
logic(colors,["orange"]); //false

Possibly using underscore.js?