访问者属性出错：无法重新定义不可配置的属性“status” [英] Error in accessor property: can't redefine non-configurable property 'status'

问题描述

我正在尝试定义一个对象并为其创建访问者属性。

I'm trying to define an object and create an accessor property for it.

HTML：

<input type='hidden' id='crudMode' value='Create' />

JavaScript：

JavaScript:

crudMode = {
   create: "Create",
   read: "Read",
   update: "Update",
   delete: "Delete",
   current: function () { return $('#crudMode').val(); }
}

Object.defineProperty(crudMode, 'mode', {
    get: function(){
        return this.current();
    },
    set: function(value){ 
        $('#crudMode').val(value);
    }
});

但是当我使用它时，会在问题标题中抛出上述错误：

But when I use it, it throws the mentioned error in the question title:

console.log(crudMode.mode);

抛出：

TypeError：无法重新定义不可配置的属性'mode'

TypeError: can't redefine non-configurable property 'mode'

这里有什么问题？

推荐答案

MDC文档说，除了'get'和'set'，你需要在调用Object.defineProperty时将标志'configurable'设置为true。

MDC documentation says that, as well as 'get' and 'set', you need a flag 'configurable' set to true when calling Object.defineProperty.

https： //developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/defineProperty

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