Sem*_*ram 4 javascript class async-await ecmascript-2017
有没有办法获取类的构造函数的调用函数?
class TestClass {
constructor(options) {
if(<caller> !== TestClass.create)
throw new Error('Use TestClass.create() instead')
this.options = options
}
static async create(options) {
// async options check
return new TestClass(options)
}
}
let test = await TestClass.create()
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我试过了arguments.callee.caller
,TestClass.caller
但出现以下错误:
Uncaught TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them
Uncaught TypeError: 'caller' and 'arguments' are restricted function properties and cannot be accessed in this context.
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在 Chrome 58 中测试
您可以通过不同的方式实现这一点:拒绝任何构造函数的使用,并让该create
方法创建一个对象实例Object.create
(它不会调用构造函数):
class TestClass {
constructor() {
throw new Error('Use TestClass.create() instead');
}
static async create(options) {
// async options check
const obj = Object.create(TestClass.prototype);
obj.options = options;
return obj;
}
}
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