<body>
<script type= "Text/javascript" >
function Sum (ARG1,ARG2) {//numeric addition functions
var sarg1 = new String (ARG1); Convert incoming arguments to strings for parameter checking
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 (); Throws an exception when a parameter is empty
E0. Serial = 1000001; Error number
if (sarg1== "")//fill in the correct error message according to the null parameter
{
E0.message = "Sum function argument is illegal: the 1th parameter is empty! "; Error description Information
}
Else
{
E0.message = "Sum function argument is illegal: the 2nd parameter is empty! ";
}
throw E0; Throw an error message
}
for (i=0;i<sarg1.length;i++) {//parameter legality check
for (j=0;j<10;j++) {//Check all characters
if (Sarg1.charat (i) ==j)//If it is not a number, throw an error message
{
Break Jump out of the loop
}
Else
{
if (j==9)//When the number has been queried to 9 o'clock
{
var e1 = new Error (); Error Message Object
E1. Serial = 1000001; Error number
E1.message = "Sum function parameter:" + Sarg1 + "is an illegal number! "; Error description Information
Throw E1;
}
}
}
}
for (k=0;k<sarg2.length;k++)//Check parameter 2 is a number
{
for (l=0;l<10;l++) {//compare from 0 to 9 individually
if (Sarg2.charat (k) ==l)//If the number is 0~9
{
Break
}
Else
{
if (l==9)//only contains non-digits throws an error message
{
var e2 = new Error (); Create Error Object
E2. Serial = 1000001; Exception number
E2.message = "Sum function parameter:" + Sarg2 + "is an illegal number! ";
throw E2;
}
}
}
}
Return number (ARG1) + number (ARG2); Parameters are correct then return two worth of
}
Single-machine event handler for function Button1_onclick () {//"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); Calling functions for calculations
Text3.value = sum; Output calculation results
}
catch (E) {//error message output error occurs
alert (e.message); Information in the output exception
if (E.serail = = 1000001)//If it is number 1,000,001th error
{
alert (e.message);
e = null;
}
}
}
</script>
<input type= "text" id= "Text1" style= "width:84px" maxlength= "/>"
+
<input type= "text" id= "Text2" style= "width:75px" maxlength= "/>"
=
<input type= "text" id= "Text3" style= "width:69px" >
<input type= "button" id= "Button1" value= "Calculate" onclick= "return Button1_onclick ()"/>
</body>
Implements a numeric addition function that returns the sum of two digits. Parameter validation is required and throws an exception if the parameter is not a number or is empty.
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