利用JS計(jì)算距離某天的時(shí)間

2012/11/5 19:16:03作者：佚名來源：網(wǎng)絡(luò)

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【實(shí)例名稱】

【實(shí)例描述】

距離某天的時(shí)間一般用于提醒特別重大的日子，如建國、結(jié)婚紀(jì)念日等。本例以建國日為標(biāo)準(zhǔn)，學(xué)習(xí)如何獲取距離某天的時(shí)間。

【實(shí)例代碼】

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>標(biāo)題頁-學(xué)無憂（denvermotorcycleaccidentlawyer.com）</title>
</head>
<body bgcolor="#fef4d9" onLoad="startclock()">
<SCRIPT LANGUAGE="JavaScript">
//基本變量的定義
var timerID;
var timerRunning = false;
var today = new Date();
var startday = new Date();
var secPerDay = 0;
var minPerDay = 0;
var hourPerDay = 0;
var secsLeft = 0;
var secsRound = 0;
var secsRemain = 0;
var minLeft = 0;
var minRound = 0;
var minRemain = 0;
var timeRemain = 0;
//停止定時(shí)器的方法
function stopclock()
{
        if(timerRunning)
                clearTimeout(timerID);
        timerRunning = false;
}
//開始定時(shí)器的方法
function startclock()
{
        stopclock();
        showtime1();
}
//計(jì)算時(shí)間的方法
function showtime1()
{
startday = new Date("Oct 20, 1949 00:00 EDT");  
//創(chuàng)建初始時(shí)間
        startday.setYear("1949");           
//設(shè)置年份
        today = new Date();                 
//獲取當(dāng)前時(shí)間
        secsPerDay = 1000 ;                 
//最終轉(zhuǎn)換為毫秒
        minPerDay = 60 * 1000 ;             
//每分鐘的毫秒
        hoursPerDay = 60 * 60 * 1000;       
//每小時(shí)的毫秒
        PerDay = 24 * 60 * 60 * 1000;       
//每天的毫秒
        /* Seconds */
        secsLeft = (today.getTime() - 
startday.getTime()) / minPerDay;
//距今天的分鐘數(shù)
        secsRound = Math.round(secsLeft); 
//四舍五入
        secsRemain = secsLeft - secsRound;
        secsRemain = (secsRemain < 0) ? secsRemain = 
60 - ((secsRound - secsLeft) * 60) : secsRemain = 
(secsLeft - secsRound) * 60;
        secsRemain = Math.round(secsRemain); 
//計(jì)算取分鐘后剩余的秒數(shù)
        /* 分鐘*/
        minLeft = ((today.getTime() - 
startday.getTime()) / hoursPerDay);
//距今天的小時(shí)數(shù)
        minRound = Math.round(minLeft); 
//四舍五入
        minRemain = minLeft - minRound;
minRemain = (minRemain < 0) ? minRemain = 60 - 
((minRound - minLeft) * 60) : minRemain = 
((minLeft - minRound) * 60);
        minRemain = Math.round(minRemain - 0.495); 
 //計(jì)算取小時(shí)后剩余的分鐘數(shù)
        /* 小時(shí) */
        hoursLeft = ((today.getTime() - 
startday.getTime()) / PerDay);
//距今天的天數(shù)
        hoursRound = Math.round(hoursLeft);
//四舍五入
        hoursRemain = hoursLeft - hoursRound;
        hoursRemain = (hoursRemain < 0) ? 
hoursRemain = 24 - ((hoursRound - hoursLeft) * 24)  : 
hoursRemain = ((hoursLeft - hoursRound) * 24);
        hoursRemain = Math.round(hoursRemain - 0.5);
//計(jì)算取天數(shù)后剩余的小時(shí)數(shù)
        /* 天 */
        daysLeft = ((today.getTime() - 
startday.getTime()) / PerDay);
//距今天的天數(shù)
        daysLeft = (daysLeft - 0.5);
        daysRound = Math.round(daysLeft);
//四舍五入     
        daysRemain = daysRound;
        /* Time */
        day_rem = " 天, "
        hour_rem = " 小時(shí), "
        min_rem = " 分, "
        sec_rem = " 秒"
        timeRemain = daysRemain + day_rem + hoursRemain 
+ hour_rem + minRemain + min_rem + secsRemain + sec_rem;
        document.up.myTxt.value = timeRemain;
 //使用文本框輸出內(nèi)容
        timerID = setTimeout("showtime1()",1000);
//每隔1秒更新下時(shí)間
        timerRunning = true;
}
</SCRIPT>
<FORM NAME="up">
<INPUT TYPE="text" NAME="myTxt" SIZE="47" VALUE="">
</FORM>
<P>
<FONT SIZE=+1 FACE="Arial">
距離建國已經(jīng)
</FONT>
</body>
</html>

【運(yùn)行效果】

距離某天的時(shí)間運(yùn)行效果

【難點(diǎn)剖析】

本例的重點(diǎn)在于時(shí)間(天、時(shí)、分、秒)的獲取。在“showtimel”方法中，使用“new Date("Oct 1，1949 00:00EDT”)”創(chuàng)建了一個(gè)建國日期對(duì)象，又使用“new Date()
獲取當(dāng)前的日期對(duì)象。最后分別獲取兩個(gè)時(shí)間的天數(shù)、小時(shí)，分、秒的間隔，并在文本框中顯示最后的計(jì)算結(jié)果。

【源碼下載】

為了JS代碼的準(zhǔn)確性，請點(diǎn)擊：距離某天的時(shí)間進(jìn)行本實(shí)例源碼下載

標(biāo)簽： JS計(jì)算時(shí)間