访问者属性出错:无法重新定义不可配置的属性"status"

Question

我正在尝试定义一个对象并为其创建一个访问器属性.

HTML:

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

JavaScript的:

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,它会在问题标题中引发提到的错误:

console.log(crudMode.mode);

抛出:

TypeError:无法重新定义不可配置的属性"mode"

这有什么不对？

Answer 1

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.

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