为什么在render中使用变量,会却出现了对象不可扩展。 首先,定义变量。(以下步骤全在class内部执行) boxOpenStyle={}; 然后,在方法open中去增加一个属性。 open(){ this.boxOpenStyle.zIndex=9; this.setState({visible:true}); } 在方法close中对该变量重新赋值。 close(){ this.boxOpenStyle.zIndex=8; ...
Im writing a webapp for a space invaders game and am getting this error when trying to write a function to get my Ship to shoot. "TypeError: can't define property "moveLaser": Object is not extensible" This is my code below.
代码语言:javascript 复制 'use strict';varobj={};Object.preventExtensions(obj);obj.x='foo';// TypeError: can't define property "x": "obj" is not extensible 在严格模式和简单模式下,Object.defineProperty()在向不可扩展对象添加新属性时引发调用。
TypeError: Cannot add property 0, object is not extensible at Array.push (<anonymous>) javascript typescript Share Improve this question Follow asked Nov 10, 2022 at 11:41 jeril 1,22433 gold badges2222 silver badges3636 bronze badges Add a comment 2 Answers Sorted by...
Object.is() (2) 实例方法 实例方法就是定义在Object原型对象Object.prototype上的方法。它可以被Object实例直接使用。 Object实例对象的方法,主要有以下六个: Object.prototype.valueOf():返回当前对象对应的值。 Object.prototype.toString():返回当前对象对应的字符串形式。
Javascript对象属性? 、、 我知道所有对象属性都有一个名称,并具有value、configurable、enumerable和writable等属性。但我在文章中看到,对象也具有prototype、class和extensible等属性。我理解prototype属性用于指向父对象。但我不明白的是class属性是什么?有这样的属性吗?extensible不是isExtensible()对象的一种方法吗?
JavaScript 提供了一个内部数据结构,用来描述对象的属性,控制它的行为,比如该属性是否可写、可遍历等等。这个内部数据结构称为“属性描述对象”(attributes object)。每个属性都有自己对应的属性描述对象,保存该属性的一些元信息。 {value:"zhang",//该属性的属性值,默认为undefined。writable:false,//表示属性值(value...
Describe the bug Installed @storybook/addon-info to work with a Vue app, but I've been unable to get it working as it seems to break storybook as it renders the error Cannot add property components, object is not extensible. I've tried t...
Error Cannot add property _Ctor, object is not extensible What is expected? Attempting to create a component library that has SSR support What is actually happening? Cannot add property _Ctor, object is not extensible The package has additional components and i have gone through one by one an...