how we can call methods which are used in called function

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 <script>

function muloperator()

{

 var val1 = parseInt(document.getElementById("txt1").value);

        var val2 = parseInt(document.getElementById("txt2").value); 

       var ans=document.getElementById("demo")
 
}
 
  sum()

 {

      ans.value = val1+ val2;

}

minus()

{

ans.value = val1 - val2;

}

mul()

{

ans.value = val1+ val2;

}

div()

{

ans.value = val1+ val2;

}

    </script>

<body>

<fieldset>

<form>

    <input type="text" id="txt1" name="text1">

    <input type="text" id="txt2" name="text2">

<input type="button" value="+" name="submit"><input type="button" value="-" name="submit">

<input type="button" value="*" name="submit">

<input type="button" value="/" name="submit">

<input type="text" id="demo" name="demo" onclick="muloperator()"/>

Jul 7 '16 #1

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2957

Dormilich

8,658

Expert Mod 8TB

your functions don't make sense. from a sum() function anyone would expect that you pass in two values and get back their sum.

next, assigning the result is obviously not the responsibility of a calculation function.

and then there is the issue that the buttons do nothing at all.

Jul 7 '16 #2

Sherin

64KB

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 function Product(name, price) {

  this.name = name;

  this.price = price;

}
 
function Food(name, price) {

  Product.call(this, name, price);

  this.category = 'food';

}
 
console.log(new Food('cheese', 5).name);

May 6 '20 #3

lewish95

For a start, let’s teach the user to say hello:

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 let user = {

  name: "John",

  age: 30

};
 
user.sayHi = function() {

  alert("Hello!");

};
 
user.sayHi(); // Hello!

Here we’ve just used a Function Expression to create the function and assign it to the property user.sayHi of the object.

Then we can call it. The user can now speak!

A function that is the property of an object is called its method.

So, here we’ve got a method sayHi of the object user.

Of course, we could use a pre-declared function as a method, like this:

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let user = {

  // ...

};
 
// first, declare

function sayHi() {

  alert("Hello!");

};
 
// then add as a method

user.sayHi = sayHi;
 
user.sayHi(); // Hello!

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how we can call methods which are used in called function

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