以前要用到日历控件都是直接从网上下载一套源码来使用，心里一直有个梗，就是想自己动手写一个日历控件，最近刚好来了兴趣，时间上也允许，于是自己摸索写了一个，功能还算完善，界面就凑合了。可能最值得说的一点就是让input控件内部右边显示一个按钮，我是直接给input加了个背景，然后把input的边框去掉实现的。
这个是最初版的，再往后打算做出纯Javascript版的，再往后打算用JQuery做一套。
<!doctype html><html><head><meta charset="utf-8"><title>日历控件</title><style>#date_text { background-image: url(images/input.png); background-repeat:no-repeat; width: 198px; height: 27px; border:none; padding-left:5px; cursor:pointer;}#cal_body { width: 198px; height: auto; overflow:hidden; border: solid 1px #CCCCCC; display: none; position:absolute; z-index:10;}.line { width:100%; height:26px; float:left; background-color:#0FF; font-size:14px;}.cube { float:left; width:26px; height:26px; line-height:26px; text-align:center; margin-left:2px; margin-bottom:2px;}.btn { float:left; background-color:#CCC; margin-left:10px; width:20px; height:20px; text-align:center; line-height:20px; border-radius:3px; border:solid 1px; margin-top:2px; cursor:pointer;}.year_month { float:left; margin-left:10px; width:90px; height:19px; text-align:center; line-height:19px; border-radius:6px;}.end_tag { height:26px; line-height:26px; margin-left:10px;}</style><script>Date.PRototype.toFormatString = function(){ var result = this.getFullYear() + "-" + (this.getMonth() + 1) + "-" + this.getDate(); return result;};String.prototype.year = function(){ var str = this.substring(0,4); return str;};String.prototype.month = function(){ var start = this.indexOf("-") + 1; var end = this.lastIndexOf("-"); return parseInt(this.substring(start, end)) - 1;};String.prototype.date = function(){ var start = this.lastIndexOf("-") + 1; return this.substring(start);}; var today = new Date();var month_big = new Array("1","3","5","7","8","10","12"); //包含所有大月的数组var month_small = new Array("4","6","9","11"); //包含所有小月的数组 //判断数组array中是否包含元素obj的函数，包含则返回true，不包含则返回falsefunction array_contain(array, obj){ for (var i = 0; i < array.length; i++){ if (array[i] == obj) return true; } return false;}//判断年份year是否为闰年，是闰年则返回true，否则返回falsefunction isLeapYear(year){ var a = year % 4; var b = year % 100; var c = year % 400; if( ( (a == 0) && (b != 0) ) || (c == 0) ){ return true; } return false;}function hideCalendar(){ var calbody = document.getElementById("cal_body"); cal_body.style.display = "none";}function showCalendar(){ var calbody = document.getElementById("cal_body"); var style = getDefaultStyle(calbody,"display"); if(style == "none") cal_body.style.display = "block"; if(style == "block") cal_body.style.display = "none"; var date_text = document.getElementById("date_text"); var val = date_text.value; init(val);}function init(val){ clearCube(); var temp_date; var year; var month; var date; var date_text = document.getElementById("date_text"); if(val == ""){ temp_date = today; date_text.value = today.toFormatString(); } else{ year = val.year(); month = val.month(); date = val.date(); temp_date = new Date(year,month,date); } year = temp_date.getFullYear(); month = temp_date.getMonth() + 1; date = temp_date.getDate(); temp_date.setDate(1); var start = temp_date.getDay() + 7; var end; if(array_contain(month_big, month)){ end = start + 31; } else if(array_contain(month_small, month)){ end = start + 30; } else{ if(isLeapYear(year)){ end = start + 29; } else{ end = start + 28; } } for(var i = start; i < end; i++){ var cube = document.getElementsByClassName("cube").item(i); cube.innerHTML = i - start + 1; cube.style.cursor = "pointer"; cube.onmouSEOver = function(){ this.style.backgroundColor = '#0FF'; } if(date == (i - start + 1)) cube.style.backgroundColor = '#0FF'; else{ cube.onmouseout = function(){ this.style.backgroundColor = ''; } } cube.onclick = function(){ date_text.value = year + "-" + month + "-" + this.innerHTML; cal_body.style.display = "none"; } } document.getElementById("text_year").value = year; document.getElementById("text_month").value = month;}function clearCube(){ for(var i=7; i < 49; i++){ var cube = document.getElementsByClassName("cube").item(i); cube.innerHTML = ""; cube.style.backgroundColor = ""; }}function yearDown(){ if(isValidated()){ var old_year = parseInt(document.getElementById("text_year").value); if(old_year > 1960){ var year = old_year - 1; var month = parseInt(document.getElementById("text_month").value); var val = year + "-" + month + "-" + 1; init(val); } }}function yearUp(){ if(isValidated()){ var old_year = parseInt(document.getElementById("text_year").value); if(old_year < 2050){ var year = old_year + 1; var month = parseInt(document.getElementById("text_month").value); var val = year + "-" + month + "-" + 1; init(val); } }}function monthDown(){ if(isValidated()){ var old_month = parseInt(document.getElementById("text_month").value) if(old_month > 1){ var year = parseInt(document.getElementById("text_year").value); var month = old_month - 1; var val = year + "-" + month + "-" + 1; init(val); } else { var year = parseInt(document.getElementById("text_year").value) - 1; var month = 12; var val = year + "-" + month + "-" + 1; init(val); } } }function monthUp(){ if(isValidated()){ var old_month = parseInt(document.getElementById("text_month").value) if(old_month < 12){ var year = parseInt(document.getElementById("text_year").value); var month = parseInt(document.getElementById("text_month").value) + 1; var val = year + "-" + month + "-" + 1; init(val); } else { var year = parseInt(document.getElementById("text_year").value) + 1; var month = 1; var val = year + "-" + month + "-" + 1; init(val); } }}function isValidated(){ var year = document.getElementById("text_year").value; var month = document.getElementById("text_month").value; if(isNaN(year) || isNaN(month)){ alert("请输入正确的年份/月份"); return false; } else{ if(year%1 != 0 || month%1 != 0){ alert("请输入正确的年份/月份"); return false; } else{ year = parseInt(year); if(year < 1960 || year > 2050){ alert("请输入1960~2050之间的年份！"); return false; } else if(month < 1 || month >12){ alert("请输入正确的月份！"); return false; } else{ return true; } } }}function changed(){ if(isValidated()){ var year = document.getElementById("text_year").value; var month = document.getElementById("text_month").value; var val = year + "-" + month + "-" + 1; init(val); }}function getDefaultStyle(obj,attribute){ return obj.currentStyle?obj.currentStyle[attribute]:document.defaultView.getComputedStyle(obj,false)[attribute];}</script></head><body><div id="container"><div id="input_bg"><input id="date_text" type="text" readonly onClick="showCalendar()" /></div><div id="cal_body"> <div class="line"><div class="btn" id="year_dow
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