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

问题描述

假设您有一个Javascript对象，如{'cat'：'meow'，'dog'：'woof'...}
是否有更简洁的方法从对象中选择一个随机属性而不是我提出了一个冗长的方式：

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

所选答案将运作良好。但是，这个答案将运行得更快：

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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