'a'))//{ value: 0, writable: false, enumerable: true, configurable: false }console.log(Object.getOwnPropertyDescriptor(obj,'b'))//{ value: 1, writable: false, enumerable: true, configurable: false }
I am currently trying to implement an isomorphic react component in my node.js + express build. However, when I try to include the said component into my jade template to render it, I get this error:TypeError: Can't add property context, object is not extensible Here is my routes file:...
"use strict";var obj = {};Object.preventExtensions(obj);obj.name = "Frankie"; // 报错，Uncaught TypeError: Cannot add property name, object is not extensible 严格模式下，删除一个不可删除的属性，会报错。"use strict";// 报错，Uncaught TypeError: Cannot delete property 'prototype' of function...
可用方法:在密封对象(Object.seal(obj))的基础上把现有属性的writable都调整为false: //在密封对象(Object.seal(obj))的基础上把现有属性的writable都调整为false var damu = {}; Object.defineProperty(damu,'wife',{ value:'lbb', //writable:true }); //密封 Object.seal(damu); //防扩展 Object.preve...
Object.isExtensible 方法:Object.isExtensible() 方法判断一个对象是否是可扩展的(是否可以在它上面添加新的属性)。 语法: Object.isExtensible(obj)参数: obj 需要检测的对象; 默认情况下,创建的对象默认是可扩展 //新对象默认是可扩展的无论何种方式创建的对象 ...
console.log(obj); // Uncaught TypeError: Cannot add property name, object is not extensible </script> 2.3 函数 2.3.1 函数不能有重名参数 非严格模式下,如果一个函数的参数有重名的不会报错,严格模式下会报错。 非严格模式: <script> function say(name, name) { ...
Object.preventExtensions(obj); obj.x=1;// Uncaught TypeError: Cannot add property x, object is not extensible 1. 2. 3. 4. 5. 6. 7. 8. 不允许使用保留关键字命名变量 // 非严格模式 vareval=1; console.log(eval);// 1 1. 2. ...
1. Object.freeze Object.freeze做了两件事情,(1)给对象设置,Object.preventExtension(obj1),禁止更改原型,禁止添加...
(function(){'use strict';o.p='1'}());// TypeError: Can't add property bar, object is not extensible 不过,对于使用了preventExtensions方法的对象,可以用delete命令删除它的现有属性。 varo=newObject();o.p=1;Object.preventExtensions(o);deleteo.p;o.p// undefined ...
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...