"use strict"
var obj = {}
Object.defineProperty(obj, 'year', {
// configurable: false, 默认false
// writable: false, 默认false
value: 2
})
Object.defineProperty(obj, 'class', {
configurable: true,
// writable: false, 默认false
value: 'chua'
})
var proxy = new Proxy(obj, {
set(target, prop, val){
target[prop] = val
return true
}
})
proxy.card = 'sdf' // 设置成功
proxy.year = 10 // Uncaught TypeError: Cannot assign to read only property 'year' of object
proxy.class = 'dd' // Uncaught TypeError: Cannot assign to read only property 'class' of object
<!DOCTYPE html>
<html>
<body>
Proxy: 目标对象属性是不可写的数据属性
</body>
</html>