/TypeScript/Uncaught TypeError: Cannot read property 'value' of undefined at Object.onChange

Uncaught TypeError: Cannot read property 'value' of undefined at Object.onChange

var x=document.form1.n1.value;
var y=document.form1.n2.value;
var z=document.form1.n3.value;
function verif(x,y,z){
    if (isNaN(x)|| isNaN(y) || isNaN(z))){
        alert("Verifier les champs de saisie");
        return false;
    }
    else { return true}
}
function compar(){
if(verif(x,y,z)){ 
    if (x==z==y){
    alert("les trois variables sont identiques");
}if ((x==z) || (z==y) || (x==y)){
    alert("Deux variables sont de valeurs égales");}
else{
        alert("les trois variables sont différentes");}}}

Similar codes

14 votes201 views3 answers
Generic arrow function typescript
TypeScript
2 votes205 views2 answers
How to get the elements that missing in other tables sql
TypeScript
3 votes273 views1 answer
Typescript == vs ===
TypeScript
0 vote194 views1 answer
Grid layout elements in one row
TypeScript
-1 vote224 views1 answer
How to make dots react native
TypeScript
1 vote195 views1 answer
Remove duplicates from array angular
TypeScript
6 votes195 views2 answers
Ignore typescript error
TypeScript
2 votes214 views1 answer
Create model class angular
TypeScript
0 vote202 views1 answer
Spread types may only be created from object types firebase
TypeScript
0 vote196 views1 answer
How to choose automation over manual testing
TypeScript