题解 | #监听对象#
监听对象
https://www.nowcoder.com/practice/2cd8f8421e9b42b98152f56ef5e0ac79
Object.keys(person).forEach((key) => {
// 要在外面获取到key的value值
let oldValue = person[key];
Object.defineProperty(person, key, {
configurable: true,
get() {
console.log("读取了数据");
return oldValue;
},
set(newValue) {
oldValue = newValue;
console.log("更改了新数据");
_render(ul);
},
});
});
// 2
for (const key of Object.keys(person)) {
let oldValue = person[key];
Object.defineProperty(person, key, {
configurable: true,
get() {
console.log("读取数据");
return oldValue;
},
set(newValue) {
oldValue = newValue;
console.log("更改了新数据");
_render(ul);
},
});
}
。