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<!DOCTYPE html> <html> <body> <h1>Demo: Prototype</h1> <script> function Student() { this.name = 'John'; this.gender = 'Male'; } Student.prototype.age = 15; var studObj1 = new Student(); alert('studObj1.age = ' + studObj1.age); var studObj2 = new Student(); alert('studObj2.age = ' + studObj2.age); Student.prototype = { age : 20 }; var studObj3 = new Student(); alert('studObj3.age = ' + studObj3.age); alert('studObj1.age = ' + studObj1.age); alert('studObj2.age = ' + studObj2.age); </script> </body> </html>
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