从 1970 年之前的日期数组中获取最高日期

Question

为什么我的代码不起作用？我想一旦我在日期上使用 getTime() 而不是尝试比较它会起作用的日期，但它没有。请帮忙。我也意识到现在这个例子可能是平等的，但对于我的实际项目来说，它可能是这样，所以请不要免除任何答案。谢谢。

var x = new Date(1960,07,16);
var y = new Date(1950,04,28);
var z = new Date(1940,01,07);
    
var playerData = [
    {name: "John", date: x.getTime()},
    {name: "Bill", date: y.getTime()},
    {name: "Greg", date: z.getTime()},
    
];

function findHighScore() {
    var highDateSoFar = null;
    var result;
    for (var i = 0; i < playerData.length; i++) {
        if (playerData[i].date > highDateSoFar) {
            result = playerData[i];
            highDateSoFar = playerData[i].date;
        }
        else if (playerData[i].date === highDateSoFar) {	
            result = 'equal';
        
    }
    }
    return result;
}
    
var highPlayer = findHighScore();
var highPlayerName = highPlayer.name;
var highPlayerDate = highPlayer.date;
var highPlayerIndex = playerData.indexOf(highPlayer);
console.log({highPlayer});

Answer 1

您的问题是您将highDateSoFar 初始化为null。当您对 null 进行大于比较时，您将不会得到您正在寻找的结果。将初始化更改为var highDateSoFar = -Number.MAX_VALUE。这会将它作为可能的最低值开始，因此第一次比较肯定会为真。

var x = new Date(1960,07,16);
var y = new Date(1950,04,28);
var z = new Date(1940,01,07);
    
var playerData = [
    {name: "John", date: x.getTime()},
    {name: "Bill", date: y.getTime()},
    {name: "Greg", date: z.getTime()},
    
];

function findHighScore() {
    var highDateSoFar = -Number.MAX_VALUE;
    var result;
    for (var i = 0; i < playerData.length; i++) {
        if (playerData[i].date > highDateSoFar) {
            result = playerData[i];
            highDateSoFar = playerData[i].date;
        }
        else if (playerData[i].date === highDateSoFar) {	
            result = 'equal';
        
    }
    }
    return result;
}
    
var highPlayer = findHighScore();
var highPlayerName = highPlayer.name;
var highPlayerDate = highPlayer.date;
var highPlayerIndex = playerData.indexOf(highPlayer);
console.log({highPlayer});