分析:localStorage.getItem(“SET_HISTORY_KEY”) 这个值有可能为空,所以再执行getItem就会报错此刻对象可能为空。
In recent years, scientists have increasingly taken to investigate the predictive nature of cognition. We argue that prediction relies on abstraction, and thus ...
一直疑惑静态类、静态方法、静态变量的内存驻用情况。今天就写了个Demo来深入八一八他们的区别和注意点。