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這篇文章主要介紹了JavaScript通過(guò)prototype給對(duì)象定義屬性用法,實(shí)例分析了prototype的功能及使用技巧,具有一定參考借鑒價(jià)值,需要的朋友可以參考下

本文實(shí)例講述了JavaScript通過(guò)prototype給對(duì)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(duì)象。在使用對(duì)象的過(guò)程中又通過(guò)prototype給對(duì)象添加了isComedy屬性，調(diào)用的時(shí)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(duì)大家的javascript程序設(shè)計(jì)有所幫助。

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