JavaScript的面向对象编程
{// JS'OOP// 9 如何自定义用户代码片段：VSCode =》左下角设置 =》用户代码片段 =》新建全局代码片段文件... =》自定义片段名称 =》编辑用户片段 =》ctrl+S 保存// JS中的面向对象编程"Print to console": {"prefix": "JS'OOP","body": ["//JavaScript中面向对象编程：主要依赖构造函数刻出类，new关键字创建实例，\".\"操作符调用属性及方法","function Person (name, age) {//构造函数(类)"," this.name = name"," this.age = age"," this.sayName = function () {","console.log(this.name)"," }"," }"," //注意：类名要求大字首字母，构造函数最后一句是隐藏了的\"return this;\",各个实例相似却是独立内存"," var p1 = new Person(\"张三\", 18) //创建实例"," p1.sayName() // => 张三"," "," var p2 = new Person(\"李四\", 23)"," p2.sayName() // => 李四","//更少内存的面向对象编程方案（私有属性及方法写构造方法里，共享属性及方法写原型里）：用Person.prototype对象存放实例们共享的属性及方法，每个构造函数都有prototype对象，且互相关联属性及方法的地址(Person.prototype , Person.prototype.constructor)","//实例调用共享属性及方法：p1.__proto__.共享属性及方法(`__proto__` 是非标准属性,是一个指向构造函数原型的指针)","//实例p1.sayName()的运行会先去实例本身找sayName方法，没找到则自动通过__proto__指针去原型里找sayName()方法，其实原型也有__proto__也会继续向上查找，直到发现Object.prototype.__proto__=null","","function Person (name, age) {//构造函数内放：私有属性及方法"," this.name = name"," this.age = age"," }"," ","Person.prototype = {原型内放：共享属性及方法"," constructor: Person, // => 手动将 constructor 指向正确的构造函数"," type: \"学生\","," sayHello: function () {"," console.log(\"我叫\" + this.name + \"，我今年\" + this.age + \"岁了\")"," }",],"description": "JS中的面向对象编程"}}
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