Javascript implements a numeric addition Function

Javascript implements a numeric addition Function

This article mainly introduces how to implement a numeric addition function in javascript, which is very simple and practical for you to understand javascript. If you need it, you can refer to it.

If you don't talk nonsense, simply provide the code.

JS

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<Script type = "text/javascript"> Function Sum (arg1, arg2) {// numeric addition function Var sarg1 = new String (arg1); // convert the input parameter into a String for parameter check Var sarg2 = new String (arg2); // convert parameter 2 to character type If (sarg1 = "") | (sarg2 = "") // make sure the parameter is not empty { Var e0 = new Error (); // If a parameter is null, an exception is thrown. E0.Serial = 1000001; // error code If (sarg1 = "") // enter the correct error message based on the null Parameter { The e0.message = "Sum function parameter is invalid: the first parameter is null! "; // Error description } Else { The e0.message = "Sum function parameter is invalid: the first parameter is null! "; } Throw e0; // throw an error message } For (I = 0; I <sarg1.length; I ++) {// check the parameter Validity For (j = 0; j <10; j ++) {// check all characters If (sarg1.charAt (I) = j) // if it is not a number, an error message is thrown. { Break; // skip Loop } Else { If (j = 9) // when the number 9 has been queried { Var e1 = new Error (); // Error message object E1.Serial = 1000001; // error code E1.message = "Sum function parameter:" + sarg1 + "is an invalid number! "; // Error description Throw e1; } } } } For (k = 0; k <sarg2.length; k ++) // check that parameter 2 is a number { For (l = 0; l <10; l ++) {// compare one by one from 0 to 9 If (sarg2.charAt (k) = l) // if it is 0 ~ 9 digits { Break; } Else { If (l = 9) // only contains non-numbers, an error message is thrown. { Var e2 = new Error (); // create an Error object E2.Serial = 1000001; // error code E2.message = "Sum function parameter:" + sarg2 + "is an invalid number! "; Throw e2; } } } } Return Number (arg1) + Number (arg2); // if both parameters are correct, two values are returned. } Function Button1_onclick () {// single-host event handler for the "compute" button Try { Var Text1 = document. getElementById ("Text1 "); Var Text2 = document. getElementById ("Text2 "); Var Text3 = document. getElementById ("Text3 "); Var sum = Sum (Text1.value, Text2.value); // call the function for Calculation   Text3.value = sum; // output the calculation result } Catch (e) {// output error message if an error occurs Alert (e. message); // output information in the exception If (e. Serail = 1000001) // if it is error 1000001 { Alert (e. message ); E = null; } } } </Script>

HTML:

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<Input type = "text" id = "Text1" style = "width: 84px" maxlength = "20"/> + <Input type = "text" id = "Text2" style = "width: 75px" maxlength = "20"/> = <Input type = "text" id = "Text3" style = "width: 69px"> <Input type = "button" id = "Button1" value = "Calculate" onclick = "return Button1_onclick ()"/>

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