第一次居然忘记写close（）。
第二次写成这样子了
，
，
后面问同事，居然没人遇到遇到过，于是去百度，也没看见这样子的。后面直接放下手上的工作，休息了一会儿，然后再来看，突然发现，这不就是已经被其他对象调用了，导致无法继续使用吗，后面我就把前一个注释掉，也就可以了。遇事需要冷静！
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