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JavaScript通過prototype給對象定義屬性用法實例
編輯:關於JavaScript     

本文實例講述了JavaScript通過prototype給對象定義屬性的用法。分享給大家供大家參考。具體分析如下:

下面的JS代碼定義了movie對象。在使用對象的過程中又通過prototype給對象添加了isComedy屬性,調用的時候直接使用object.isComedy即可,非常方便。

<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
}
var officeSpace = new movie("OfficeSpace");
var narnia = new movie("Narnia","Andrew Adamson");
movie.prototype.isComedy = false; //add a field to the movie's prototype
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>

希望本文所述對大家的javascript程序設計有所幫助。

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