723 B
723 B
title | localeTitle |
---|---|
Construct JavaScript Objects with Functions | 用函数构造JavaScript对象 |
使用构造函数,可以使用蓝图或构造函数轻松创建新对象。声明语法略有不同,但仍然易于记忆。
// Let's add the properties engines and seats to the car in the same way that the property wheels has been added below. They should both be numbers.
var Car = function() {
this.wheels = 4;
this.engines = 1;
this.seats = 1;
};
var myCar = new Car();
构造函数的名称通常以大写字母开头(与其他函数不同,后者往往以小写字符开头)。大写字母应该有助于提醒开发人员在使用该函数创建对象时使用new关键字。