这篇文章主要介绍了JavaScript通过prototype给对象定义属性用法,实例分析了prototype的功能及使用技巧,具有一定参考借鉴价值,需要的朋友可以参考下

本文实例讲述了JavaScript通过prototype给对象定义属性的用法。分享给大家供大家参考。具体分析如下：

下面的JS代码定义了movie对象。在使用对象的过程中又通过prototype给对象添加了isComedy属性，调用的时候直接使用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>

希望本文所述对大家的javascript程序设计有所帮助。

更多信息请查看IT技术专栏