The sum of several attributes of a JS gadget cannot exceed a specific value._javascript tips

The most famous example is the assignment of attribute values ​​​​to new generals in Romance of the Three Kingdoms and Taige.
I have used javascript to create such a function, and by the way, hide the underline of the links in the page.
Everyone has a look Look, if you have any better optimization suggestions, feel free to mention them.
The following is the code:
The first is test.html:

Copy the code The code is as follows:

< td height="30" bordercolor="#FFFFFF" bgcolor="#D0E8FF" class="font1">

username

< td height="30" bordercolor="#FFFFFF" bgcolor="#D0E8FF" class="font1">

＋< ;/font>	< div align="center">－
meili		＋	－< ;/font>

Also link.css:

Copy code The code is as follows:

.A {
text-transform: none;
text-decoration: none;
}
.a:hover {
text -decoration: underline
}

Finally util.js (this code is quite long):

Copy code The code is as follows:

var flag=false;
function add(formname){
if (formname.username.value == "") {
alert("Please enter a positive integer");
formname.username.focus();
return false;
}
flag = checkscope(formname);
if(flag==false){
return false;
}
if( parseInt(formname.username.value)>0){
formname.username.value =parseInt(formname.username.value) 1;
if(parseInt(formname.username. value) parseInt(formname.meili.value)>10){
alert("The sum of the entered integers must not be greater than 10");
formname.username.value =10-parseInt(formname.meili.value );
return false;
}else
return true;
}else{
alert("The entered integer must be greater than 0");
formname.username.value =1 ;
return false;
}
}
function subtration(formname){
if (formname.username.value == "") {
alert("Please enter a positive integer");
formname.username.focus();
return false;
}
flag = checkscope(formname);
if(flag==false){
return false;
}
if( parseInt(formname.username.value)>1){
formname.username.value =parseInt(formname.username.value)-1;
if(parseInt (formname.username.value) parseInt(formname.meili.value)>10){
alert("The sum of the entered integers must not be greater than 10");
formname.username.value =10-parseInt( formname.meili.value);
return false;
}else
return true;
}else if(parseInt(formname.username.value) ==1){
alert(" It is already the minimum value and cannot be reduced anymore");
return false;
}else{
alert("The entered integer must be greater than 1");
formname.username.value =1;
return false;
}
}
function add2(formname){
if (formname.meili.value == "") {
alert("Please enter a positive integer ");
formname.meili.focus();
return false;
}
flag = checkscope(formname);
if(flag==false){
return false ;
}
if( parseInt(formname.meili.value)>0){
formname.meili.value =parseInt(formname.meili.value) 1;
if(parseInt(formname .username.value) parseInt(formname.meili.value)>10){
alert("The sum of the entered integers must not be greater than 10");
formname.meili.value =10-parseInt(formname. username.value);
return false;
}else
return true;
}else{
alert("The entered integer must be greater than 0");
formname.meili. value=1;
return false;
}
}
function subtration2(formname){
if (formname.meili.value == "") {
alert("Please Enter a positive integer");
formname.meili.focus();
return false;
}
flag = checkscope(formname);
if(flag==false){
return false;
}
if( parseInt(formname.meili.value)>1){
formname.meili.value =parseInt(formname.meili.value)-1;
if(parseInt(formname.username.value) parseInt(formname.meili.value)>10){
alert("The sum of the entered integers must not be greater than 10");
formname.meili.value =10 -parseInt(formname.username.value);
return false;
}else
return true;
}else if(parseInt(formname.meili.value) ==1){
alert("It is already the minimum value and cannot be reduced anymore");
return false;
}else{
alert("The entered integer must be greater than 1");
formname.meili.value =1;
return false;
}
}
function checkscope(formname){
if((parseInt(formname.username.value)>9)||(parseInt(formname .username.value)<1)){
alert("username input number exceeds the allowed range 1-9");
formname.username.value=1;
formname.username.focus( );
return false;
}
if((parseInt(formname.meili.value)>9)||(parseInt(formname.meili.value)<1)){
alert("meili input number exceeds the allowed range 1-9");
formname.meili.value=1;
formname.meili.focus();
return false;
}
return true;
}

Put the three files in the same folder, and then try the effect. I am definitely not lying to you.