Uncaught TypeError: Cannot add property 0, object is not extensible 引起的思考

默认情况下，对象都是可以扩展的，即对象可以添加新的属性和方法。使用Object.preventExtensions()、Object.seal()和Object.freeze()方法都可以标记对象为不可扩展。

var obj = Object.freeze({});
Object.isExtensible(obj); // false

obj.push()

Uncaught TypeError: Cannot assign to read only property 'length' of object '[object Array]'

obj.push('')
Uncaught TypeError:Cannot add property 0, object is not extensible

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Uncaught TypeError: Cannot add property 0, object is not extensible 引起的思考

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