After a period of programming, I feel that these JavaScript is long, so they are sorted out, and they have judge whether it is empty, judges the number, judging the amount, and the judgment time. Like those who can write into JS, it is simplified on the page.
No title document </ title> <script language = "javascript"> Remove space Function Trim (Str) {if (str.charat (0) == "") {str.slice (1); str = trim (str);} Return Str;} Judgment is empty Function ISempty (Pobj, Errmsg ) {Var obj = evAl (pobj); if (Obj == null || trim (obj.value) == "") {if (errmsg == null || errmsg == ") ALERT (" input is empty ! "); Else Alert (errmsg); obj.focus (); returnif;} Return true;} Decision is a digital function isnumber (Pobj, errmsg) {var obj = evAl (pobj); strref =" 1234567890 "; IF (! iSempty (Pobj, Errmsg) Return False; for (i = 0; i <obj.value.length; i ) {tempchar = obj.value.substring (i, i 1); if (strref.indexof) (TempChar, 0) == - 1) {if (errmsg == NULL || errmsg == ")) Alert (" Data does not meet the requirements, please check "); else alert (errmsg); if (obj.type = = "text") obj.focus (); return false;}} return true;</p>
<p>/ / Judgment is a number, the number can be negative function isnegative (Pobj, errmsg) {var obj = evAl (pobj); strref = "1234567890-"; if (! ISempty (Pobj, errmsg)) Return False; for (i = 0; i <obj.value.Length; i ) {tempchar = obj.value.substring (i, i 1); if (strref.indexof (Tempchar, 0) == - 1) {if (errmsg == Null || errmsg == "") ALERT ("Data does not meet the requirements, please check"); else alert (errmsg); if (obj.type == "text") obj.focus (); return false;} Else {IF (i> 0) {if (obj.valubstring (i, i 1) == "-") {if (errmsg == null || errmsg == ") Alert (" data does not meet the requirements , Please check "); Else Alert (errmsg); if (obj.type ==" text ") obj.focus (); returnaf true;}}}} Return True;} Judgment is the form of money Function ismoney (POBJ) {var obj = evAl (pobj); strref = "1234567890."; if (! iSempty (Pobj, errmsg) Return False; for (i = 0; i <obj.value.length; i ) {Tempchar = obj.value.substring (i, i 1); if (strref.indexof (TempChar, 0) == - 1) {if (errmsg == null || errmsg == ") Alert (" data does not match Require, please check "); else alert (errmsg); if (obj.type ==" text ") OBJ .focus (); return false;} else {templen = obj.value.indexof ("."); if (templen! = - 1) {strlen = obj.valubstring (Templen 1, Obj.value.LENGTH ); If (Strlen.Length> 2) {if (errmsg == null || errmsg == ") Alert (" Data does not meet the requirements, please check "); else alert (errmsg); if (obj.type = = "text") obj.focus (); return false;}}}}}}}}}}} Return True;</p>
<p>Function isleApyear (Year) {IF ((Year% 4 == 0 && Year% 100! = 0) || (Year% 400 == 0)) {return true;}} // The judgment time is correct</p>
<p>Function isdate (CheckText) {var datetime; var year, month, day; var gone, gtwo; if (Trim (checktext.value)! = "") {datetime = trim (checktext.value); if (DateTime.length = = 10) {year = datetime.substring (0,4); if (iSNAN (Year) == true) {alert ("Please enter the date! Format is (YYYY-MM-DD) case (2001-01-01) ! "); CheckText.focus (); return false;} gone = datetime.substring (4, 5); Month = DATETIME.SUBSTRING (5, 7); if (isnan (Month) == true) {Alert (" Please enter the date! YYYY-MM-DD) Example (2001-01-01)! "); Checktext.focus (); return false;} gtwo = datetime.substring (7, 8); day = datetime. Substring (8, 10); if (isnan (day) == true) {alert ("Please enter the date! Format is (YYYY-MM-DD) case (2001-01-01)!"); CheckText.focus ); Return false;} if ((gtwo == "-") && (gtwo == "-")) {if (Month <1 || Month> 12) {alert ("Month must be between 01 and 12 ! "); CheckText.focus (); return false;} if (DAY <1 || day> 31) {alert (" The date must be between 01 and 31! "); Checktext.focus (); return false; } else {if (Month == 2) {if (isleapyear && day> 29) {Alert ("February Date must be between 01 to 29!"); CheckText.focus (); Return False;} if (! isleapyear (year) && day> 28) {Alert ("February Date must be between 01 to 28!"); checktext.focus (); return false;}} = 4 || Month == 6 || Month == 9 || Month == 11) && (Day> 30)) {alert ("in four, six, nine, November Date must be between 01 to 30! "); CheckText.focus (); return false;}}} else {Alert (" Please enter the date! YYYY-MM-DD) (2001-01-01) "); checktext.focus (); Return false;}} else {alert ("</p>
<p>Please enter the date! Format is (YYYY-MM-DD) case (2001-01-01) "); checktext.focus (); return false;}} else {return true;} return true;} </ script> < Script language = "javascript"> function checked (theform) {if (! iSempty (theform.aa, 'Please enter data')) Return False;} </ script> </ head> <body> <form method = "POST "action =" "name =" dd "onSubmit =" return checked (this); "> determines whether the input data <input type =" text "name =" aa "> <br> number determination <input type =" text " Name = "bb" onchange = "Return ISNumber (this, ');"> <br></p>
<p>The number of judgments can be negative <input type = "text" name = "DD" onchange = "Return IsNegative (this, ');"> <br> Judgment amount <input type = "text" name = "cc" = Return Ismoney (this, '); "> <br></p>
<p>Judgment time <input type = "text" name = "ee" onchange = "return isdate (this)"> <br> <input type = "submit" value = "submit"> </ form> </ body> </ HTML></p></div><div class="text-center mt-3 text-grey">
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