Pick random elements from an array without repeating

问题

I'm displaying random numbers on individual sprites and want to shuffle the individual container with the same no displaying on it. how to shuffle a set of sprites randomly without repeating the same color?

My array is:

   var color = new Array();
   color[0] = 'greenBox';
   color[1] = 'blueBox';
   color[2] = 'purpleBox';
   color[3] = 'yellowBox';
   color[4] = 'redBox';
   color[5] = 'whiteBox';
   color[6] = 'pinkBox';

回答1:

If you don't need the array later, you could do something like this:

var color = [
    "greenBox",
    "blueBox",
    ...
];

while (color.length != 0) {
    var index = Math.floor(Math.random()*color.length);
    var pickedColor = color[index];
    colors.splice(index, 1);  // This removes the picked element from the array
    doStuffWith(pickedColor);
}

This will destroy the array, but it will never pick the same element twice

来源：https://stackoverflow.com/questions/28473095/pick-random-elements-from-an-array-without-repeating