网页中实现一个计算当年还剩多少时间的倒数计时程序,要求网页上实时动态显示”××年还剩××天××时××分××秒”

面试笔试题目分类: JavaScript编码网页中实现一个计算当年还剩多少时间的倒数计时程序,要求网页上实时动态显示”××年还剩××天××时××分××秒”
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前端学堂 管理员 asked 1 year ago

1 Answers
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前端学堂 管理员 answered 1 year ago
<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>TEst</title>
</head>
<body>

    <span id="target"></span>


<script type="text/javascript">
    // 为了简化。每月默认30天
    function getTimeString() {
        var start = new Date();
        var end = new Date(start.getFullYear() + 1, 0, 1);
        var elapse = Math.floor((end - start) / 1000);

        var seconds = elapse % 60 ;
        var minutes = Math.floor(elapse / 60) % 60;
        var hours = Math.floor(elapse / (60 * 60)) % 24;
        var days = Math.floor(elapse / (60 * 60 * 24)) % 30;
        var months = Math.floor(elapse / (60 * 60 * 24 * 30)) % 12;
        var years = Math.floor(elapse / (60 * 60 * 24 * 30 * 12));

        return start.getFullYear() + '年还剩' + years + '年' + months + '月' + days + '日'
            + hours + '小时' + minutes + '分' + seconds + '秒';
    }

    function domText(elem, text) {
        if (text == undefined) {

            if (elem.textContent) {
                return elem.textContent;
            } else if (elem.innerText) {
                return elem.innerText;
            }
        } else {
            if (elem.textContent) {
                elem.textContent = text;
            } else if (elem.innerText) {
                elem.innerText = text;
            } else {
                elem.innerHTML = text;
            }
        }
    }

    var target = document.getElementById('target');

    setInterval(function () {
        domText(target, getTimeString());
    }, 1000)
</script>

</body>
</html>

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