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js固化对象
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最后更新时间：2019-06-03 00:46:18
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<p>
在框架封装，继承的时候，如果你做好了一个对象给别人使用，为了不让使用者拿过来后任意涂改，比如他把你的对象的一个方法改成了指向另一个函数，或者干脆删除了这个方法，我们需要把这个对象固化。
</p>
<p>
在
<code>JavaScript</code
>里我们可以在三个层级上固化一个对象。从宽到严它们依次是：防止扩展、密封、冻结。
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