遇到jscs 檢查報錯不解代碼如下function mixins(...list) {  return target => {    Object.assign(target.prototype, ...list)  }}const Foo = {  foo() {    console.log('foo')  }}@mixins(Foo)class MyClass {}let obj = new MyClass()obj.foo()報錯信息如下：求教為什么報錯？如何解決？