发现了一点关键地方：月份是从0开始算起的。周数也是，周日为0，周六为6。我在这方面浪费了不少时间，基础知识不足啊= =!
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>daoJiShi</title> <mce:style type="text/css"><!-- body { background:#000; color:#fff; } h1 { text-align:center;} .daoJiShi { font-size:50px; } --></mce:style><style type="text/css" mce_bogus="1"> body { background:#000; color:#fff; } h1 { text-align:center;} .daoJiShi { font-size:50px; } </style> <mce:script language="javascript"><!-- function DaoJiShi() { var now = new Date(); var target = new Date(2012,11,21,00,00,00); //PS：月数从0开始算 var days = document.getElementById("days"); var hours = document.getElementById("hours"); var minutes = document.getElementById("minutes"); var seconds = document.getElementById("seconds"); var getDays = Math.floor( (target-now)/1000/60/60/24 ); //获得天数； var getHours = Math.floor( (target-now)/1000/60/60%24 ); //获得小时； var getMinutes = Math.floor( (target-now)/1000/60%60 ); //获得分钟； var getSeconds = Math.floor( (target-now)/1000%60 );//获得秒数； days.innerHTML = " "+ getDays +" "; //输入天数； hours.innerHTML = " "+ getHours +" "; //输入小时； minutes.innerHTML = " "+ getMinutes +" "; //输入分钟； seconds.innerHTML = " "+ getSeconds +" "; //输入秒数； setTimeout("DaoJiShi()",1000); } // --></mce:script> </head> <body οnlοad="DaoJiShi()"> <h1>离2012年12月21日世界末日还有<span class="daoJiShi" id="days"></span>天<span class="daoJiShi" id="hours"> </span>小时<span class="daoJiShi" id="minutes"> </span>分钟<span class="daoJiShi" id="seconds"> </span>秒</h1> </body> </html>
