原生JS写的日期；-优快云博客

本文介绍了一个基于HTML、CSS及JavaScript实现的日期选择器。该选择器通过动态生成年份、月份和日期选项来帮助用户选择特定日期，并利用JavaScript进行交互控制。文章详细展示了如何使用JavaScript操作DOM元素来完成这一过程。

<body>
<div id="datebox"></div>
<div style="display: flex;">
    <div class="years">

    </div>
    <div class="mouth" style="display: none">

    </div>
    <div class="day" style="display: none">

    </div>
</div>
</body>
<script>
var startYear = 1918;
    var years = document.getElementsByClassName('years')[0];
    var mouth = document.getElementsByClassName('mouth')[0];
    var days = document.getElementsByClassName('day')[0];
    for(var k = startYear; k <= 2018; k++){
        var node = createNode(k);
        years.appendChild(node);
    }
    for(var m = 1; m <= 12; m++){
        var node = createNode(m);
        mouth.appendChild(node);
    }
    function createDay(option){
        for(var i = 1; i <= option; i++){
            var node = createNode(i);
            days.appendChild(node);
        }
    }
    function createNode (num){
        var node = document.createElement('a');
        node.innerHTML = num;
        node.style.display = 'block';
        return node;
    }
    function year(years){
        return years%100 == 0 ? (years%400 == 0 ? 1 : 0) : (years%4 == 0 ? 1 : 0);
    }
    function day(mouths, fn){
        if(fn == 1 && mouths == 2){
            return 29;
        }else{
            if(mouths == 2){
                return 28;
            }else if(mouths == 4 ||mouths == 6 ||mouths == 9 || mouths == 11){//4 6 7 9 11 -> 30
   alert(mouths);
                return 30;
            }else{
                return 31;
            }
        }
    }
    years.addEventListener('click', function(e){
        var temps = [];
  alert(e.target.innerHTML);
        temps.push(e.target.innerHTML);
        mouth.style.display = 'block';
        mouth.addEventListener('click', function(e){
            temps.push(e.target.innerHTML);
            days.style.display = 'block';
   alert(temps[1]);
           createDay(day(temps[1], year(temps[0])));
     days.addEventListener('click', function(e){
                temps.push(e.target.innerHTML);
                var dates = temps[0] + '年' + temps[1] + '月' + temps[2] + '日';
                datebox.innerHTML = dates;
                this.style.display = 'none';
                mouth.style.display = 'none';
                years.style.display = 'none';
            })
        })
    })</script>
</html>