IsDate() in JavaScript?
原帖地址：http://www.codetoad.com/forum/17_10053.asp
我筛选了，大致的方法有以下几个。
function myIsDate(mystring){//--BOF var mystring, myresult ;var mystring = new Date(mystring);isNaN(mystring)? myresult=false : myresult=true ;return myresult ;//--EOF}//我的测试 alert(IsDate('2009/10/10')); //true alert(IsDate('2010/07/00')); //true alert(IsDate('2009/02/30')); //true alert(IsDate('200k/10/10')); //false alert(IsDate('2009/13/10')); //true alert(IsDate('200k-10-10')); //false//失败function isDate (value){return (!isNaN (new Date (value).getYear () ) ) ;}//我的测试 alert(IsDate('2009/10/10')); //true alert(IsDate('2010/07/00')); //true alert(IsDate('2009/02/30')); //true alert(IsDate('200k/10/10')); //false alert(IsDate('2009/13/10')); //true alert(IsDate('200k-10-10')); //false//失败// 这个可以，稍微改改，加上匹配'2010-01-10'就好了。// ******************************************************************// This function accepts a string variable and verifies if it is a// proper date or not. It validates format matching either// mm-dd-yyyy or mm/dd/yyyy. Then it checks to make sure the month// has the proper number of days, based on which month it is.// The function returns true if a valid date, false if not.// ******************************************************************function isDate(dateStr) {var datePat = /^(\d{1,2})(\/|-)(\d{1,2})(\/|-)(\d{4})$/;var matchArray = dateStr.match(datePat); // is the format ok?if (matchArray == null) {alert("Please enter date as either mm/dd/yyyy or mm-dd-yyyy.");return false;}month = matchArray[1]; // p@rse date into variablesday = matchArray[3];year = matchArray[5];if (month < 1 || month > 12) { // check month rangealert("Month must be between 1 and 12.");return false;}if (day < 1 || day > 31) {alert("Day must be between 1 and 31.");return false;}if ((month==4 || month==6 || month==9 || month==11) && day==31) {alert("Month "+month+" doesn`t have 31 days!")return false;}if (month == 2) { // check for february 29thvar isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));if (day > 29 || (day==29 && !isleap)) {alert("February " + year + " doesn`t have " + day + " days!");return false;}}return true; // date is valid}function IsDate(dateval){ var arr = new Array(); if(dateval.indexOf("-") != -1){ arr = dateval.toString().split("-"); }else if(dateval.indexOf("/") != -1){ arr = dateval.toString().split("/"); }else{ return false; } //yyyy-mm-dd || yyyy/mm/dd if(arr[0].length==4){ var date = new Date(arr[0],arr[1]-1,arr[2]); if(date.getFullYear()==arr[0] && date.getMonth()==arr[1]-1 && date.getDate()==arr[2]){ return true; } } //dd-mm-yyyy || dd/mm/yyyy if(arr[2].length==4){ var date = new Date(arr[2],arr[1]-1,arr[0]); if(date.getFullYear()==arr[2] && date.getMonth()==arr[1]-1 && date.getDate()==arr[0]){ return true; } } //mm-dd-yyyy || mm/dd/yyyy if(arr[2].length==4){ var date = new Date(arr[2],arr[0]-1,arr[1]); if(date.getFullYear()==arr[2] && date.getMonth()==arr[0]-1 && date.getDate()==arr[1]){ return true; } } return false;} alert(IsDate('2009/10/10')); //true alert(IsDate('2010/07/00')); //false alert(IsDate('2009/02/30')); //false alert(IsDate('200k/10/10')); //false alert(IsDate('2009/13/10')); //false alert(IsDate('200k-10-10')); //false alert(IsDate('2000-02-29')) //true alert(IsDate('2100-02-29')) //true//就是你了//匹配//yyyy-mm-dd || yyyy/mm/dd function isDate(str) { var r = str.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/); if(r==null)return false; var d = new Date(r[1], r[3]-1, r[4]); return (d.getFullYear()==r[1]&&(d.getMonth()+1)==r[3]&&d.getDate()==r[4]); } //这个也行！