创建对象,为对象添加方法,属性,动态的添加和删除,示例代码如下:
- <html>
- <head>
- <TITLE>使用对象直接创建对象</TITLE>
- <SCRIPT Language = "JavaScript">
- {
- var circle = {x:0,y:0,radius:2};
- document.write("<br>圆心在：", circle.x," ",circle.y,"半径为:",circle.radius);
- document.write("<br><br>函数创建对象<br>");
- function student(name,chinese,math,english)
- {
- this.name=name;
- this.chinese = chinese;
- this.math = math;
- this.english = english;
- this.avg2=avg2;
- }
- //
- function avg()
- {
- return ((this.chinese + this.math + this.english)/3);
- }
- function avg2()
- {
- return (((this.chinese + this.math + this.english)/3)+5);
- }
- }
- </SCRIPT>
- </head>
- <body>
- <SCRIPT Language = "JavaScript">
- {
- var st1 = new student("zzc",88,95,20);
- document.write("姓名"+ st1.name + "<br>");
- document.write("语文"+ st1.chinese + "<br>");
- document.write("数学"+ st1.math + "<br>");
- document.write("英语"+ st1.english + "<br>");
- st1.avg = avg;
- var avgscore = st1.avg();
- var avgscores = st1.avg2();
- document.write("平均分"+ avgscore + "<br>");
- document.write("平均分+5 = "+ avgscores + "<br>");
- document.write("Delete object<br>");
- document.write("st1对象属性和方法:<br>");
- for(var i in st1)
- document.write(st1[i]+ "<br>");
- document.write("<br>删除对象的属性(english)方法(avg2)<br>");
- delete st1.avg2;
- delete st1.english;
- for(var i in st1)
- document.write(st1[i]+ "<br>");
- }
- </SCRIPT>
- </body>
- </html>