js實作日期級聯效果_javascript技巧

複製程式碼 程式碼如下: 请选择 年 选择 月 选择 日 function window.onload() { strYYYY = document.form1.YYYY.outerHTML; strMM = document.form1.MM.outerHTML; strDD = document.form1.DD.outerHTML; MonHead = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

//先给年下拉框赋内容 var y = new Date().getFullYear(); var str = strYYYY.substring(0, strYYYY.length - 9); for (var i = (y - 30); i { str += " " + i + " 年" + " \r\n"; } document.form1.YYYY.outerHTML = str + " ";

//赋月份的下拉框 var str = strMM.substring(0, strMM.length - 9); for (var i = 1; i str += " " + i + " 月" + " \r\n"; } document.form1.MM.outerHTML = str + " ";

document.form1.YYYY.value = y; document.form1.MM.value = new Date().getMonth() + 1; var n = MonHead[new Date().getMonth()]; if (new Date().getMonth() == 1 && IsPinYear(YYYYvalue)) n++; writeDay(n); //赋日期下拉框 document.form1.DD.value = new Date().getDate(); }

function YYYYMM(str) //年发生变化时日期发生变化(主要是判断闰平年) { var MMvalue = document.form1.MM.options[document.form1.MM.selectedIndex].value; if (MMvalue == "") { DD.outerHTML = strDD; return; } var n = MonHead[MMvalue - 1]; if (MMvalue == 2 && IsPinYear(str)) n++; writeDay(n) }

function MMDD(str) //月发生变化时日期联动 { var YYYYvalue = document.form1.YYYY.options[document.form1.YYYY.selectedIndex].value; if (str == "") { DD.outerHTML = strDD; return; } var n = MonHead[str - 1]; if (str == 2 && IsPinYear(YYYYvalue)) n++; writeDay(n) }

function writeDay(n) //依條件寫日期的下拉方塊 { for (var i = 1; i s = " " i " 日" " ""; }

function IsPinYear(year)//判斷是否閏平年

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