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55 lines
2.0 KiB
JavaScript
55 lines
2.0 KiB
JavaScript
// refer: https://juejin.cn/post/6844903960705236999
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var xhr = new window.XMLHttpRequest;
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xhr.responseType = "document";
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// 通过get的方式请求当前文件
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xhr.open("head", location.href);
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xhr.send(null);
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// 监听请求状态变化
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xhr.onreadystatechange = function () {
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var time = null,
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curDate = null;
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if (xhr.readyState === 2) {
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// 获取响应头里的时间戳
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time = xhr.getResponseHeader("Date");
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// countDown(new Date(time).getTime());
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var timeOff = getTimeOff(new Date(time).getTime());
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var target = document.getElementById("timeOff");
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if (target) {
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target.innerHTML = "本地时间比服务器" + (timeOff > 0 ? "慢" : "快") + Math.abs(timeOff / 1000) + "秒";
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}
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}
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};
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function getTimeOff(time) {
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let serverTime = getNowDate(time, 8); // Head请求，返回服务器当前时间戳
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let localTime = getNowDate(Date.now(), 8); // 用户本地时间戳
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let timeOff = serverTime - localTime;
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return timeOff;
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}
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// function countDown(time) {
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// let targetTime = Date.parse('2025/12/12 00:00:00');
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// let serverTime = getNowDate(time, 8); // Head请求，返回服务器当前时间戳
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// let localTime = getNowDate(Date.now(), 8); // 用户本地时间戳
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// let timeOff = serverTime - localTime;
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// let rightTargetTime = targetTime - timeOff; // 去除偏差后的目标时间
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// if(rightTargetTime <= localTime) {
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// console.log('按钮可点击')
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// } else {
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// console.log('按钮不可点击')
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// }
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// }
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function getNowDate(localTime, timeZone) {
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var timezone = timeZone || 8; //目标时区时间，东八区
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// 本地时间和格林威治的时间差，单位为分钟
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var offset_GMT = new Date().getTimezoneOffset();
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// 本地时间距 1970 年 1 月 1 日午夜（GMT 时间）之间的毫秒数
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var nowDate = localTime;
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var targetDate = nowDate + offset_GMT * 60 * 1000 + timezone * 60 * 60 * 1000;
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return targetDate;
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} |