从 Javascript 对象中选择随机属性 [英] Pick random property from a Javascript object

问题描述

假设你有一个 Javascript 对象，如 {'cat':'meow','dog':'woof' ...}有没有比我想出的这种冗长的方法更简洁的方法来从对象中选择一个随机属性:

Suppose you have a Javascript object like {'cat':'meow','dog':'woof' ...} Is there a more concise way to pick a random property from the object than this long winded way I came up with:

function pickRandomProperty(obj) {
    var prop, len = 0, randomPos, pos = 0;
    for (prop in obj) {
        if (obj.hasOwnProperty(prop)) {
            len += 1;
        }
    }
    randomPos = Math.floor(Math.random() * len);
    for (prop in obj) {
        if (obj.hasOwnProperty(prop)) {
            if (pos === randomPos) {
                return prop;
            }
            pos += 1;
        }
    }       
}

推荐答案

选择的答案会很好用.但是，这个答案会运行得更快:

The chosen answer will work well. However, this answer will run faster:

var randomProperty = function (obj) {
    var keys = Object.keys(obj);
    return obj[keys[ keys.length * Math.random() << 0]];
};

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