代码如下： <!--第一步：把如下代码加入到<head>区域中--> <SCRIPT LANGUAGE="JavaScript"> <!-- Begin // Check browser version var isNav4 = false, isNav5 = false, isIE4 = false var strSeperator = "/"; // If you are using any Java validation on the back side you will want to use the / because // Java date validations do not recognize the dash as a valid date separator. var vDateType = 3; // Global value for type of date format // 1 = mm/dd/yyyy // 2 = yyyy/dd/mm (Unable to do date check at this time) // 3 = dd/mm/yyyy var vYearType = 4; //Set to 2 or 4 for number of digits in the year for Netscape var vYearLength = 2; // Set to 4 if you want to force the user to enter 4 digits for the year before validating. var err = 0; // Set the error code to a default of zero if(navigator.appName == "Netscape") { if (navigator.appVersion < "5") { isNav4 = true; isNav5 = false; } else if (navigator.appVersion > "4") { isNav4 = false; isNav5 = true; } } else { isIE4 = true; } function DateFormat(vDateName, vDateValue, e, dateCheck, dateType) { vDateType = dateType; // vDateName = object name // vDateValue = value in the field being checked // e = event // dateCheck // True = Verify that the vDateValue is a valid date // False = Format values being entered into vDateValue only // vDateType // 1 = mm/dd/yyyy // 2 = yyyy/mm/dd // 3 = dd/mm/yyyy //Enter a tilde sign for the first number and you can check the variable information. if (vDateValue == "~") { alert("AppVersion = "+navigator.appVersion+" \nNav. 4 Version = "+isNav4+" \nNav. 5 Version = "+isNav5+" \nIE Version = "+isIE4+" \nYear Type = "+vYearType+" \nDate Type = "+vDateType+" \nSeparator = "+strSeperator); vDateName.value = ""; vDateName.focus(); return true; } var whichCode = (window.Event) ? e.which : e.keyCode; // Check to see if a seperator is already present. // bypass the date if a seperator is present and the length greater than 8 if (vDateValue.length > 8 && isNav4) { if ((vDateValue.indexOf("-") >= 1) || (vDateValue.indexOf("/") >= 1)) return true; } //Eliminate all the ASCII codes that are not valid var alphaCheck = " abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/-"; if (alphaCheck.indexOf(vDateValue) >= 1) { if (isNav4) { vDateName.value = ""; vDateName.focus(); vDateName.select(); return false; } else { vDateName.value = vDateName.value.substr(0, (vDateValue.length-1)); return false; } } if (whichCode == 8) //Ignore the Netscape value for backspace. IE has no value return false; else { //Create numeric string values for 0123456789/ //The codes provided include both keyboard and keypad values var strCheck = '47,48,49,50,51,52,53,54,55,56,57,58,59,95,96,97,98,99,100,101,102,103,104,105'; if (strCheck.indexOf(whichCode) != -1) { if (isNav4) { if (((vDateValue.length < 6 && dateCheck) || (vDateValue.length == 7 && dateCheck)) && (vDateValue.length >=1)) { alert("错误的日期\n请重新输入"); vDateName.value = ""; vDateName.focus(); vDateName.select(); return false; } if (vDateValue.length == 6 && dateCheck) { var mDay = vDateName.value.substr(2,2); var mMonth = vDateName.value.substr(0,2); var mYear = vDateName.value.substr(4,4) //Turn a two digit year into a 4 digit year if (mYear.length == 2 && vYearType == 4) { var mToday = new Date(); //If the year is greater than 30 years from now use 19, otherwise use 20 var checkYear = mToday.getFullYear() + 30; var mCheckYear = '20' + mYear; if (mCheckYear >= checkYear) mYear = '19' + mYear; else mYear = '20' + mYear; } var vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear; if (!dateValid(vDateValueCheck)) { alert("错误的日期\n请重新输入"); vDateName.value = ""; vDateName.focus(); vDateName.select(); return false; } return true; } else { // Reformat the date for validation and set date type to a 1 if (vDateValue.length >= 8 && dateCheck) { if (vDateType == 1) // mmddyyyy { var mDay = vDateName.value.substr(2,2); var mMonth = vDateName.value.substr(0,2); var mYear = vDateName.value.substr(4,4) vDateName.value = mMonth+strSeperator+mDay+strSeperator+mYear; } if (vDateType == 2) // yyyymmdd { var mYear = vDateName.value.substr(0,4) var mMonth = vDateName.value.substr(4,2); var mDay = vDateName.value.substr(6,2); vDateName.value = mYear+strSeperator+mMonth+strSeperator+mDay; } if (vDateType == 3) // ddmmyyyy { var mMonth = vDateName.value.substr(2,2); var mDay = vDateName.value.substr(0,2); var mYear = vDateName.value.substr(4,4) vDateName.value = mDay+strSeperator+mMonth+strSeperator+mYear; } //Create a temporary variable for storing the DateType and change //the DateType to a 1 for validation. var vDateTypeTemp = vDateType; vDateType = 1; var vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear; if (!dateValid(vDateValueCheck)) { alert("错误的日期\n请重新输入"); vDateType = vDateTypeTemp; vDateName.value = ""; vDateName.focus(); vDateName.select(); return false; } vDateType = vDateTypeTemp; return true; } else { if (((vDateValue.length < 8 && dateCheck) || (vDateValue.length == 9 && dateCheck)) && (vDateValue.length >=1)) { alert("错误的日期\n请重新输入"); vDateName.value = ""; vDateName.focus(); vDateName.select(); return false; } } } } else { // Non isNav Check if (((vDateValue.length < 8 && dateCheck) || (vDateValue.length == 9 && dateCheck)) && (vDateValue.length >=1)) { alert("错误的日期\n请重新输入"); vDateName.value = ""; vDateName.focus(); return true; } // Reformat date to format that can be validated. mm/dd/yyyy if (vDateValue.length >= 8 && dateCheck) { // Additional date formats can be entered here and parsed out to // a valid date format that the validation routine will recognize. if (vDateType == 1) // mm/dd/yyyy { var mMonth = vDateName.value.substr(0,2); var mDay = vDateName.value.substr(3,2); var mYear = vDateName.value.substr(6,4) } if (vDateType == 2) // yyyy/mm/dd { var mYear = vDateName.value.substr(0,4) var mMonth = vDateName.value.substr(5,2); var mDay = vDateName.value.substr(8,2); } if (vDateType == 3) // dd/mm/yyyy { var mDay = vDateName.value.substr(0,2); var mMonth = vDateName.value.substr(3,2); var mYear = vDateName.value.substr(6,4) } if (vYearLength == 4) { if (mYear.length < 4) { alert("错误的日期\n请重新输入"); vDateName.value = ""; vDateName.focus(); return true; } } // Create temp. variable for storing the current vDateType var vDateTypeTemp = vDateType; // Change vDateType to a 1 for standard date format for validation // Type will be changed back when validation is completed. vDateType = 1; // Store reformatted date to new variable for validation. var vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear; if (mYear.length == 2 && vYearType == 4 && dateCheck) { //Turn a two digit year into a 4 digit year var mToday = new Date(); //If the year is greater than 30 years from now use 19, otherwise use 20 var checkYear = mToday.getFullYear() + 30; var mCheckYear = '20' + mYear; if (mCheckYear >= checkYear) mYear = '19' + mYear; else mYear = '20' + mYear; vDateValueCheck = mMonth+strSeperator+mDay+strSeperator+mYear; // Store the new value back to the field. This function will // not work with date type of 2 since the year is entered first. if (vDateTypeTemp == 1) // mm/dd/yyyy vDateName.value = mMonth+strSeperator+mDay+strSeperator+mYear; if (vDateTypeTemp == 3) // dd/mm/yyyy vDateName.value = mDay+strSeperator+mMonth+strSeperator+mYear; } if (!dateValid(vDateValueCheck)) { alert("错误的日期\n请重新输入"); vDateType = vDateTypeTemp; vDateName.value = ""; vDateName.focus(); return true; } vDateType = vDateTypeTemp; return true; } else { if (vDateType == 1) { if (vDateValue.length == 2) { vDateName.value = vDateValue+strSeperator; } if (vDateValue.length == 5) { vDateName.value = vDateValue+strSeperator; } } if (vDateType == 2) { if (vDateValue.length == 4) { vDateName.value = vDateValue+strSeperator; } if (vDateValue.length == 7) { vDateName.value = vDateValue+strSeperator; } } if (vDateType == 3) { if (vDateValue.length == 2) { vDateName.value = vDateValue+strSeperator; } if (vDateValue.length == 5) { vDateName.value = vDateValue+strSeperator; } } return true; } } if (vDateValue.length == 10&& dateCheck) { if (!dateValid(vDateName)) { // Un-comment the next line of code for debugging the dateValid() function error messages //alert(err); alert("错误的日期\n请重新输入"); vDateName.focus(); vDateName.select(); } } return false; } else { // If the value is not in the string return the string minus the last // key entered. if (isNav4) { vDateName.value = ""; vDateName.focus(); vDateName.select(); return false; } else { vDateName.value = vDateName.value.substr(0, (vDateValue.length-1)); return false; } } } } function dateValid(objName) { var strDate; var strDateArray; var strDay; var strMonth; var strYear; var intday; var intMonth; var intYear; var booFound = false; var datefield = objName; var strSeparatorArray = new Array("-"," ","/","."); var intElementNr; // var err = 0; var strMonthArray = new Array(12); strMonthArray[0] = "Jan"; strMonthArray[1] = "Feb"; strMonthArray[2] = "Mar"; strMonthArray[3] = "Apr"; strMonthArray[4] = "May"; strMonthArray[5] = "Jun"; strMonthArray[6] = "Jul"; strMonthArray[7] = "Aug"; strMonthArray[8] = "Sep"; strMonthArray[9] = "Oct"; strMonthArray[10] = "Nov"; strMonthArray[11] = "Dec"; //strDate = datefield.value; strDate = objName; if (strDate.length < 1) { return true; } for (intElementNr = 0; intElementNr < strSeparatorArray.length; intElementNr++) { if (strDate.indexOf(strSeparatorArray[intElementNr]) != -1) { strDateArray = strDate.split(strSeparatorArray[intElementNr]); if (strDateArray.length != 3) { err = 1; return false; } else { strDay = strDateArray[0]; strMonth = strDateArray[1]; strYear = strDateArray[2]; } booFound = true; } } if (booFound == false) { if (strDate.length>5) { strDay = strDate.substr(0, 2); strMonth = strDate.substr(2, 2); strYear = strDate.substr(4); } } //Adjustment for short years entered if (strYear.length == 2) { strYear = '20' + strYear; } strTemp = strDay; strDay = strMonth; strMonth = strTemp; intday = parseInt(strDay, 10); if (isNaN(intday)) { err = 2; return false; } intMonth = parseInt(strMonth, 10); if (isNaN(intMonth)) { for (i = 0;i<12;i++) { if (strMonth.toUpperCase() == strMonthArray[i].toUpperCase()) { intMonth = i+1; strMonth = strMonthArray[i]; i = 12; } } if (isNaN(intMonth)) { err = 3; return false; } } intYear = parseInt(strYear, 10); if (isNaN(intYear)) { err = 4; return false; } if (intMonth>12 || intMonth<1) { err = 5; return false; } if ((intMonth == 1 || intMonth == 3 || intMonth == 5 || intMonth == 7 || intMonth == 8 || intMonth == 10 || intMonth == 12) && (intday > 31 || intday < 1)) { err = 6; return false; } if ((intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11) && (intday > 30 || intday < 1)) { err = 7; return false; } if (intMonth == 2) { if (intday < 1) { err = 8; return false; } if (LeapYear(intYear) == true) { if (intday > 29) { err = 9; return false; } } else { if (intday > 28) { err = 10; return false; } } } return true; } function LeapYear(intYear) { if (intYear % 100 == 0) { if (intYear % 400 == 0) { return true; } } else { if ((intYear % 4) == 0) { return true; } } return false; } // End --> </script> <!--第二步：把如下代码加入到<body>区域中--> <form name=dateTest> <table border=0 width=400 align="center"> <tr> <td> <table align=center border=1 width=400> <tr> <td bgcolor=#000000 width=75%> <div align="center"><font color="#33FF33">格式一 - mm/dd/yyyy</font></div> </td> <td> <input type="text" name="testDateFormat1" size='10' maxlength="10" onFocus="javascript:vDateType='1'" onKeyUp="DateFormat(this,this.value,event,false,'1')" onBlur="DateFormat(this,this.value,event,true,'1')"> </td> </tr> </table> </td> </tr> <tr> <td> <table align=center border=1 width=400> <tr> <td bgcolor=#000000 width=75%> <div align="center"><font color="#33FF33">格式二 - yyyy/mm/dd</font></div> </td> <td> <input type="text" name="testDateFormat3" size='10' maxlength="10" onFocus="javascript:vDateType='2'" onKeyUp="DateFormat(this,this.value,event,false,'2')" onBlur="DateFormat(this,this.value,event,true,'2')"> </td> </tr> </table> </td> </tr> <tr> <td> <table align=center border=1 width=400> <tr> <td bgcolor=#000000 width=75%> <div align="center"><font color="#33FF33">格式三 - dd/mm/yyyy</font></div> </td> <td> <input type="text" name="testDateFormat5" size='10' maxlength="10" onFocus="javascript:vDateType='3'" onKeyUp="DateFormat(this,this.value,event,false,'3')" onBlur="DateFormat(this,this.value,event,true,'3')"> </td> </tr> </table> </td> </tr> </table> <div align="center"></div> </form> <!--第三步：把<body>中代码修改如下--> <body onLoad="document.dateTest.testDateFormat1.focus()">
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