# 日志的收集
- filebeat
# IOPS
# 日志所影响的CPU及内存
# class
/ extends
function Animal (name) {
this.name = name
}
Animal.prototype.hello = () => {
console.log('hello')
}
function Dog (name, say) {
Animal.call(this, name)
this.say = say
}
Dog.prototype = Object.create(Animal.prototype)
Reflect.defineProperty(Dog.prototype, "constructor", {
value: Dog,
enumerable: false, // 不可枚举
writable: true
})
class Animal {
constructor (name) {
this.name = name
}
hello () {
console.log('hello')
}
}
class Dog extends Animal {
constructor (name, say) {
super(name)
this.say = say
}
}