用js实现倒计时
- 发表时间: 2019-07-12
- 分类: JavaScript
- 阅读量: 623
- 作者: 七七
效果图如下：
代码奉上
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | <!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>倒计时</title></head><style type="text/css"> .time-item { width: 430px; height: 45px; margin: 0 auto; } .time-item strong { background: orange; color: #fff; line-height: 49px; font-size: 36px; font-family: Arial; padding: 0 10px; margin-right: 10px; border-radius: 5px; box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.2); } .time-item > span { float: left; line-height: 49px; color: orange; font-size: 32px; margin: 0 10px; font-family: Arial, Helvetica, sans-serif; } .title { width: 300px; height: 50px; margin:200px auto 50px auto; }</style><body> <h1 class="title">距离程序员节，还有</h1> <div class="time-item"> <span><span id="day">00</span>天</span> <strong><span id="hour">00</span>时</strong> <strong><span id="minute">00</span>分</strong> <strong><span id="second">00</span>秒</strong> </div> </body><script>function $(id) { return document.getElementById(id);}//处理innerText和textContent的兼容性问题// 设置标签之间的内容function setInnerText(element, content) { // 判断当前浏览器是否支持 innerText if (typeof element.innerText === 'string') { element.innerText = content; } else { element.textContent = content; }}// 获取两个日期的时间差function getInterval(start, end) { // 两个日期对象，相差的毫秒数 var interval = end - start; // 求 相差的天数/小时数/分钟数/秒数 var day, hour, minute, second; // 两个日期对象，相差的秒数 // interval = interval / 1000; interval /= 1000; day = Math.round(interval / 60 / 60 / 24); hour = Math.round(interval / 60 / 60 % 24); minute = Math.round(interval / 60 % 60); second = Math.round(interval % 60); return { day: day, hour: hour, minute: minute, second: second }}// 目标时间var endDate = new Date('2019-10-24 0:0:0');// 获取spanvar spanDay = $('day');var spanHour = $('hour');var spanMinute = $('minute');var spanSecond = $('second');// 倒计时function countdown() { // 计算时间差 // 当前时间 var startDate = new Date(); // 计算两个日期差 var interval = getInterval(startDate, endDate); setInnerText(spanDay, interval.day); setInnerText(spanHour, interval.hour); setInnerText(spanMinute, interval.minute); setInnerText(spanSecond, interval.second);}countdown();setInterval(countdown, 1000);</script></html> |
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