Function.call() method

The first argument is the this value, the remaining arguments are passed into the function.

 
<!DOCTYPE html>
<html>
<head>
    <title>Example</title>
    <script type="text/javascript">
        function sum(num1, num2){ 
            return num1 + num2; 
        } 
        function callSum(num1, num2){ 
            return sum.call(this, num1, num2); 
        } 
        document.writeln(callSum(10,10)); //20 
        
        
        window.color = "A"; 
        var o = { color: "B" }; 
        function sayColor(){ 
            document.writeln(this.color); 
        } 
        sayColor(); //A 
        sayColor.call(this); //A 
        sayColor.call(window); //A 
        sayColor.call(o); //B 
        
       
    </script>
</head>
<body>
</body>
</html>
Click to view the demo
Home 
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    Essential Types  

Function:
  1. The Function Type
  2. Function Declarations versus Function Expressions
  3. Functions as Values
  4. Returning a function from a function
  5. Function arguments
  6. this for function context
  7. Function caller
  8. Function length property
  9. Function apply()
  10. Function.call() method
  11. Function's bind() method
  12. Function toLocaleString() and toString()