VbsEdit is a VBScript and Javascript editor


result = object instanceof class

result: Required. Any variable.

object: Required. Any object expression.

class: Required. Any defined object class.

The instanceof operator returns true if object is an instance of class. It returns false if object is not an instance of the specified class, or if object is null.

The following example illustrates the use of the instanceof operator.

	Copy Code
function objTest(obj){ var i, t, s = ""; // Create variables. t = new Array(); // Create an array. t["Date"] = Date; // Populate the array. t["Object"] = Object; t["Array"] = Array; for (i in t) { if (obj instanceof t[i]) // Check class of obj. { s += "obj is an instance of " + i + "\n"; } else { s += "obj is not an instance of " + i + "\n"; } } return(s); // Return string. } var obj = new Date(); response.write(objTest(obj));

Copy Code

function objTest(obj){
   var i, t, s = "";   // Create variables.
   t = new Array();   // Create an array.
   t["Date"] = Date;   // Populate the array.
   t["Object"] = Object;
   t["Array"] = Array;
      for (i in t)
      {
         if (obj instanceof t[i])   // Check class of obj.
         {
            s += "obj is an instance of " + i + "\n";
         }
         else 
         {
            s += "obj is not an instance of " + i + "\n";
         }
   }
   return(s);   // Return string.
}

var obj = new Date();
response.write(objTest(obj));

Version 5

Concepts

Operator Precedence (JScript 5.6)
Operator Summary (JScript 5.6)

Arguments

Remarks

Example

Requirements

See Also

Concepts

In Vbsedit, you only need to press F1 to get Help for the keyword under the cursor!