给已有的函数对象增加属性或者方法
格式：构造函数名.prototype.新属性或者新方法
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>
<script>
function Students(name, height, age) {
this.name = name;
this.height = height;
this.age = age;
this.outputInfo = function() {
document.write('name = ' + this.name + '<br\>' + 'height = ' + this.height + '<br\>');
}
}
//增加一个新方法
Students.prototype.newFunction = function() {
document.write('此方法是通过prototype继承后实现的');
}
var stu1 = new Students('zhang', 123, 12);
stu1.outputInfo();
stu1.newFunction();
</script>
</body>
</html>
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