考虑以下代码：
function configurable(target: any,propertyKey: string,descriptor: PropertyDescriptor) {
descriptor.set = (n: number) => {
target[`_${propertyKey}`] = n * 100;
};
}
class Test {
_prop: number = 10;
@configurable
get prop(): number {
return this.prop;
}
}
const t = new Test();
t.prop = 100;
这是一个愚蠢的示例，我试图动态添加带有装饰器的setter，但是打字稿抱怨t.prop为只读
以下代码可能会对您有所帮助
function configurable(multiplierFactor: number) {
return function (target,propertyKey: string) {
const privatePropName = `_${propertyKey}`;
Object.defineProperty(target,propertyKey,{
configurable: false,get: function (this) {
return this[privatePropName];
},set: function (this,value) {
this[privatePropName] = value * multiplierFactor;
},});
}
}
class Test {
@configurable(10)
prop: number = 1;
}
const t = new Test();
console.log(t.prop) // 10
t.prop = 20;
console.log(t.prop) // 200