今天看ES6的文档时，跟着proxy的案例敲代码遇到了一个错误
出现错误的代码：

		let target = {name: 'Tom',age: 24}let handler = {get: function(target, key) {console.log('getting ' + key);return target[key]; // 不是target.key},set: function(target, key, value) {if (key === 'age') {if (!Number.isInteger(value)) {throw new TypeError('The age is not an integer');} else if (value > 200) {throw new RangeError('The age seems invalid');} else {console.log('setting ' + key);target[key] = value;}}}}let obje = {}let proxy = new Proxy(obje, handler)console.log(proxy.name) // 实际执行 handler.getconsole.log(proxy.age = 25) // 实际执行 handler.set

然后浏览器出现TypeError: proxy set handler returned false for property '“age”'的错误，百度了一下，说是set方法需要设置return，返回一个布尔值，true和false由自己设置 ，所以我加上return true 或 false时，错误消失。

更改如下

let target = {name: 'Tom',age: 24}let handler = {get: function(target, key) {console.log('getting ' + key);return target[key]; // 不是target.key},set: function(target, key, value) {if (key === 'age') {if (!Number.isInteger(value)) {throw new TypeError('The age is not an integer');return false;} else if (value > 200) {throw new RangeError('The age seems invalid');return false;} else {console.log('setting ' + key);target[key] = value;return true;}}}}let obje = {}let proxy = new Proxy(obje, handler)console.log(proxy.name) // 实际执行 handler.getconsole.log(proxy.age = 25) // 实际执行 handler.set