Create 3 empty arrays (wins, losses, points). Simply loop through your array using a for...loop which using the length to determine how many elements there are.
Use push() to add the individual parts to their respective arrays.
var data = [
{
Wins: 5,
Losses: 1,
Points: 33
},
{
Wins: 3,
Losses: 1,
Points: 21
},
{
Wins: 3,
Losses: 0,
Points: 18
}];
var wins = [], losses = [], points = [];
for(var i=0; i< data.length; i++)
{
wins.push(data[i].Wins);
losses.push(data[i].Losses);
points.push(data[i].Points);
}
console.log(wins);
console.log(losses);
console.log(points);