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var $person1 = {}, person1 = { name: 'caaa' }
Object.defineProperty($person1, 'name', {
get() { return person1.name },
set(val) { person1.name = val; console.log('发生了更新') }
})
console.log('------使用 Object.defineProperty 为 $person1 添加响应式属性-------')
console.log(`$person1.name的值为: ${$person1.name},`, `$person1.age是未定义的属性:${$person1.age}`)
console.log('\n------改变 $person1.name 为jack-------')
$person1.name = 'jack'
console.log(`$person1.name的新值为: ${$person1.name},`, `person1.name的新值也变为: ${person1.name}`)
console.log('\n------改变 $person1.age 为18-------')
$person1.age = 18
console.log(`$person1.age的值为: ${$person1.age},`, `但因为$person1.age未被setter追踪,所以person1.age并未被更新: ${person1.age}\n\n\n`)
/*******************/
var person2 = { name: 'caaa' }
var $person2 = new Proxy(person2, {
get(target, key) {
return target[key]
},
set(target, key, newVal) {
console.log(`更新了${key}`)
target[key] = newVal
}
})
console.log('\n\n\n------使用 Proxy 为 $person2 添加响应式属性-------')
console.log(`$person2.name的值为: ${$person2.name},`, `$person2.age是未定义的属性:${$person2.age}`)
console.log('\n------改变 $person2.name 为jack-------')
$person2.name = 'jack'
console.log(`$person2.name的新值为: ${$person2.name},`, `person2.name的新值也变为: ${person2.name}`)
console.log('\n------改变 $person2.age 为18-------')
$person2.age = 18
console.log(`$person2.age的值为: ${$person2.age},`, `此时即使person2.age此前未定义的值,也被更新为: ${person2.age}`)
Output
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