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Is there any chance to use prototype on a Form object, this is not working:
Form.prototype.myFunc=function()
{
alert('OK!');
}
On the other hand, String objects are extendable, for example:
String.prototype.trim = function() {
return this.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
}
735
The extends keyword can be used to extend the objects as well as classes in JavaScript. It is usually used to create a class which is child of another class. Syntax: class childclass extends parentclass {...}
All the objects have proto property. The prototype gives access to the prototype of function using function. proto gives access to the prototype of the function using the object.
The Object. setPrototypeOf() method sets the prototype (i.e., the internal [[Prototype]] property) of a specified object to another object or null. All JavaScript objects inherit properties and methods from a prototype. It is generally considered the proper way to set the prototype of an object.
Array, Map, and other built-in classes are extendable. The most impressive thing is that built-in methods such as map , filter, and more - return new objects of literally the inherited type NumsArray .
If you means HTMLFormElement, then it should be
HTMLFormElement.prototype.myFunc=function() {
alert('OK!');
};
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