JavaScript中的Proxy模块化过滤

let source = {
    name: '小李',
    price: 100,
}

function validate(target, key, value) {
    if (Reflect.has(target, key)) {
        if (key == 'price') {
            if (value < 300) {
                return target[key] = value
            }
        }
    }
    return false
    
}

let p = new Proxy(source, {
    get (target, key) {
        if (key == 'price')
        return target[key] || '';
        return '您没有权限'
    },
    set: validate
})
p.price = 200
console.log(p.price, p.name)