javascript - 如何用动态数组制作随机百分比？

Question

假设我们有数据:

var datas = [{animal:"chicken"}, {animal: "cow"}, {animal: "duck"}];
var after_massage = [];

datas.forEach(function(key){

   after_massage.push({animal: key.animal}, {percentage: randomPercent(); })

 })

现在我不知道如何为每个对象提供随机百分比，并且 3 个对象的总数不能超过 100%

Answer 1

您可以通过跟踪随机数可以达到的最大数字然后继续递减来实现此目的。理论上，这可以无限持续下去:

var datas = [{animal:"chicken"}, {animal: "cow"}, {animal: "duck"}];
var after_massage = [];
var max = 1;

var getRandomPercent = function(max) {
    var percentage = Math.random() * (max - 0) + 0;
    // every time we generate a random number, we'll decrement
    max = max - percentage;
    return percentage;
}

datas.forEach(function(key){
   after_massage.push({animal: key.animal, percentage: getRandomPercent(max) })
 });

console.log(after_massage);

参见JSFiddle