JavaScript通过prototype给对象定义属性用法实例
编程学习 2021-07-04 21:47www.dzhlxh.cn编程入门
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：
狼蚁网站SEO优化的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。