同一天生日

birthday.js

function getBirthday() {
    return Math.floor(Math.random() * 366)
}
function getBirthdayArray(num) {
    var array = []
    for (var i = 0; i < num; i++) {
        array[i] = getBirthday()
    }
    return array
}
function isArrayRepeat3(array) {
    var isOver3 = false;
    var data = array.reduce(function (prev, next) {
        prev[next] = (prev[next] + 1) || 1;
        if (prev[next] >= 3) { isOver3 = true; }
        return prev;
    }, {});
    return isOver3
}
function doVerify(people, repeat) {
    var yes = 0
    for (var i = 0; i < repeat; i++) {
        if (isArrayRepeat3(getBirthdayArray(people))) {
            yes++
        }
    }
    return Number(yes) / Number(repeat)
}
function autoVerify(accuracy) {
    var stopVerify = false
    for (people = 3; !stopVerify; people++) {
        var percent = doVerify(people, accuracy)
        console.log("people:"+people+", percent:"+percent)
        if (percent > 0.5) {
            stopVerify = true
            return people
        }
    }
}