修改隐身模式下对storage的处理 #17
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主要分为两种情况： 1. 比如在开启隐身模式情况下，```localStorage```的大小被设置为0，这样使用 ```setItem```去存储数据是会报错的，采取的是通过检测该种情况，然后采取用一个缓存对象去代替内存，并重写```setItem```, ```getItem```等 API 进行hack的方式解决。 2. 在正常情况下，浏览器是有大概 5 M 的```localStorage```使用空间（不同浏览器不同），如果存的东西比较多，就存在超出内存空间的情况，这种情况只能通过每一次执行 ```setItem```的时候去判断是不是超出内存限制了，这里使用了兼容的判断方式，不只是通过```e.name```去判断，如果出现这种错误就给用户一个提示，这里还可以继续完善就是可以让用户传一个回调，在超出内存限制的时候可以去删除一些不重要的数据进而释放空间（当然也可以直接 clear）。
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npm run watch # 实时编译 main.js
npm run test:watch # 监听代码改变运行测试用例根目录会生成 |
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好的，我想想怎么去测试这种情况。 |
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暂时先增加了一个简单的超限的测试用例，隐身模式下用对象来hack的方法测试报错太多，我还没来的及排查。怀疑是原型上的一些bug。所以暂时还原了大部分代码 |
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修改：
key,getItem等方法，上次的实现少了storage.length,storage.key。2.删除每次
setItem的时候进行超出容量限制的检测，因为超出的话本身就是会抛出异常，用户可以通过这个异常信息对症下药。