JS本身没有提供日期加减操作能力，所以借此写了几个方法，用以操作日期，主要是实现日期的加减 作者：郴州拓职任文敏
jsDate.htm var currDT; var aryDay = new Array("日","一","二","三","四","五","六"); //初始页面 function ini() { currDT = new Date(); showDate(); } //上一周 或 下一周 function addWeek(ope) { var num = 0; if(ope=="-") { num = -7; } else if(ope=="+") { num = 7; } currDT = addDate(currDT,num); showDate(); } function showDate() { span1.innerHTML = currDT.toLocaleDateString(); //显示日期 var dw = currDT.getDay(); var tdDT; //确定周一是那天 if(dw==0) { tdDT = addDate(currDT,-6); } else { tdDT = addDate(currDT,(1-dw)); } //在表格中显示一周的日期 var objTB = document.getElementById("tb1"); for(var i=0;i<7;i++) { if(tdDT.toLocaleDateString()==currDT.toLocaleDateString()) { objTB.rows[0].cells[i].style.color = "red"; //currDT突出显示 } dw = tdDT.getDay(); objTB.rows[0].cells[i].innerHTML = tdDT.getMonth()+1 + "月" + tdDT.getDate() + "日 星期" + aryDay[dw]; tdDT = addDate(tdDT,1); //下一天 } } //增加或减少若干天，由 num 的正负决定，正为加，负为减 function addDate(dt,num) { var ope = "+"; if(num<0) { ope = "-"; } var reDT = dt; for(var i=0;i<Math.abs(num);i++) { reDT = addOneDay(reDT,ope); } return reDT; } //增加或减少一天，由ope决定, + 为加，- 为减，否则不动 function addOneDay(dt,ope) { var num = 0; if(ope=="-") { num = -1; } else if(ope=="+") { num = 1; } var y = dt.getYear(); var m = dt.getMonth(); var lastDay = getLastDay(y,m); var d = dt.getDate(); d += num; if(d<1) { m--; if(m<0) { y--; m = 11; } d = getLastDay(y,m); } else if(d>lastDay) { m++; if(m>11) { y++; m = 0; } d = 1; } var reDT = new Date(); reDT.setYear(y); reDT.setMonth(m); reDT.setDate(d); return reDT; } //是否为闰年 function isLeapYear(y) { var isLeap = false; if(y%4==0 && y%100!=0 || y%400==0) { isLeap = true; } return isLeap; } //每月最后一天 function getLastDay(y,m) { var lastDay = 28; m++; if(m==1 || m==3 || m==5 || m==7 || m==8 || m==10 || m==12) { lastDay = 31; } else if(m==4 || m==6 || m==9 || m==11) { lastDay = 30; } else if(isLeapYear(y)==true) { lastDay = 29; } return lastDay; } </ script> <body onload="ini()"> ← → <table id="tb1" border="1" style="font-size:10pt"> <tr> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> </tr> </table> [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]
