In JavaScript, you can count the sum of two numbers by using the `+`

operator. The `+`

operator performs addition and concatenation, depending on the operands. When both operands are numbers, the `+`

operator performs addition.

Here’s an example of how you can count the sum of two numbers in JavaScript:

```
var x = 10;
var y = 20;
var sum = x + y;
console.log(sum); // 30
```

In the example above, the variables `x`

and `y`

are assigned the values `10`

and `20`

, respectively. The sum of `x`

and `y`

is calculated by using the `+`

operator, and the result is assigned to the variable `sum`

. Finally, the value of `sum`

is logged to the console.

You can also use the `+`

operator to add two string representations of numbers. In this case, the `+`

operator performs concatenation, but you can still get the sum by converting the strings to numbers using the `Number`

function or a unary plus operator `+`

.

Here’s an example of how you can count the sum of two string representations of numbers in JavaScript:

```
var x = "10";
var y = "20";
var sum = Number(x) + Number(y);
console.log(sum); // 30
```

In this example, the variables `x`

and `y`

are assigned the string values `"10"`

and `"20"`

, respectively. The sum of `x`

and `y`

is calculated by converting the strings to numbers using the `Number`

function, and the result is assigned to the variable `sum`

. Finally, the value of `sum`

is logged to the console.

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