function defineReactive(obj, key, val) {

Object.defineProperty(obj, key, {

enumerable: true,

configurable: true,

get: function() {

console.log('get');

return val;

},

set: function(newVal) {

console.log('set');

val += newVal;

}

});

}

let obj = {name: '成龙大哥', say: '：其实我之前是拒绝拍这个游戏广告的，'};

Object.keys(obj).forEach(k => {

defineReactive(obj, k, obj[k]);

});

console.log(obj.name + obj.say);

// obj.say = '后来我试玩了一下，哇，好热血，蛮好玩的';

// console.log(obj.name + obj.say);