proxy思考

let proxy=new Proxy({},{
    get:function (target,property) {
        return 35;
    }
})
let obj=Object.create(proxy);
console.log(obj.qq);
let person={
    name:"张三"
}
let proxyPerson=new Proxy(person,{
    get:function(target,property){
        if(property in target){
            return target[property];
        }else{
            console.log("Property \"" + property + "\" does not exist.");
        }
    }
})
console.log(proxyPerson.name);
console.log(proxyPerson.sex);

//经过实际操作，object.observe已经不能在浏览器里支持l
// var o = {};
// function observer(changes){
//     changes.forEach(function(change) {
//         console.log('发生变动的属性:' + change.name);
//         console.log('变动前的值:' + change.oldValue);
//         console.log('变动后的值:' + change.object[change.name]);
//         console.log('变动类型:' + change.type);
//     });
// }
// Object.observe(o, observer);
// o.sex="男";
//可以使用apply 对方法进行拦截代理
var target = function () { return 'I am the target'; }; var handler = {
    apply: function (receiver, ...args) { return 'I am the proxy';
    } };
var p = new Proxy(target, handler);
console.log(p());