javascript Proxy Reflect

proxy-observable.js

/**
 * Use Proxy to implement observable
 */
function observable (obj, onchange) {
	return new Proxy(obj, {
		set (target, key, value) {
			Reflect.set(target, key, value)
			onchange(key, value)
		},
		delete (target, key) {
			Reflect.delete(target, key)
			onchange(key, undefined)
		}
	})
}

let p = {
	name: 'aaron',
	age: 20
}

pp = observable(p, (key, value) => {
	console.log('proxy on change:', key, value)
})

pp.name = 'Aaron'
pp.age = 20
delete pp.age