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What's Prototypes for JavaScript?
What's Prototypes for JavaScript?
✍: Guest
Objects have "prototypes" from which they may inherit fields and functions.
<script type="text/javascript"> function movieToString() { return("title: "+this.title+" director: "+this.director); } function movie(title, director) { this.title = title; this.director = director || "unknown"; //if null assign to "unknown" this.toString = movieToString; //assign function to this method pointer } movie.prototype.isComedy = false; //add a field to the movie's prototype var officeSpace = new movie("OfficeSpace"); var narnia = new movie("Narni","Andrew Adamson"); document.write(narnia.toString()); document.write("<br />Narnia a comedy? "+narnia.isComedy); officeSpace.isComedy = true; //override the default just for this object document.write("<br />Office Space a comedy? "+officeSpace.isComedy); </script>
2011-08-23, 3595👍, 0💬
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