老师,这两种say的方法哪种正确呢,写在constructor外的不是可以节省空间吗
来源:3-3 编程练习
郫县陈冠希
2022-03-07 04:46:22
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
/*
function Person(name, age) {
this.name = name;
this.age = age;
this.say = function() {
console.log(this.name, this.age)
}
}
Person.prototype.run = function() {
console.log("run")
}
Person.intro = "this is a Person class"
Person.show = function() {
console.log('show')
}
*/
class Person {
constructor(name, age) {
this.name = name
this.age = age
this.say = function () {
console.log(`我是${this.name},我今年${this.age}岁了`);
}
}
// say() {
// console.log(`我是${this.name},我今年${this.age}岁了`);
// }
run() {
console.log("run")
}
static intro = 'this is a Person class'
static getIntro() {
return 'this is a Person class'
}
static show() {
console.log('show')
}
}
const c = new Person('ZhangSan', 18)
const c2 = new Person('ls', 18)
console.log(c.name);
console.log(c.age);
c.say()
c.run()
Person.show()
// console.log(Person.intro);
console.log(Person.getIntro());
</script>
</body>
</html>
1回答
好帮手慕慕子
2022-03-07
同学你好,写在constructor外确实可以节省空间,但是,当前练习要求是将构造函数改成class写法,构造函数中的say方法是添加到实例对象上的,所以改写为class写法,下面这种方法是对的

祝学习愉快~
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