/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

1 vote106 views1 answer
Why does mongoose minimize by default
TypeScript
0 vote109 views1 answer
Route.component does not have any construct or call signatures - React Router with TypeScript
TypeScript
0 vote100 views1 answer
Requirements check failed for jdk 8 (
TypeScript
0 vote139 views1 answer
The marking menu shortcuts to context-sensitive commands and tools. Marking menu accessed for objects:
TypeScript
0 vote97 views1 answer
Use multy line in typescript
TypeScript
6 votes95 views2 answers
Get arguments from url flask
TypeScript
0 vote104 views1 answer
Windows domain add hosts file
TypeScript
0 vote99 views1 answer
Object is possibly 'null'. 20 *ngIf="!signupForm.get('email').valid && signupForm.get('email')!.touched "
TypeScript
9 votes99 views1 answer
Typescript check if element in array
TypeScript
0 vote112 views1 answer
Destroy objects when they move below camera unity
TypeScript