在function之外的变量，声明为const, var或let,则这个变量是全局可见的；在函数内声明的变量，如果变量不带const, var或let,则这个变量也是全局的。
在函数内部定义的或者参数变量，是局部变量，函数内可见。
可以同时定义全局变量和局部变量，而且变量名可以相同，此时局部变量优先级高于全局变量。
Cornwall Capital was founded in 2003 by two young people who were not in the mainstream - Charlie Ledley, and Gammy Mak. I say they were out of the mainstream because they were not financial professionals from a scientific background, but they were full of imagination, and a keen insight into the market. Their insight is evident in the transactions of First Capital Financial. Case Background Before betting that the subprime mortgage market would collapse, Cornwall Capital first noticed a credit card business company, First Capital Financial. Throughout the 1990s and early 2000s, First Capital Financial claimed that it had better tools than other firms for analyzing the creditworthiness of subprime credit card users and pricing the risk of lending to them, and the market bought that claim. But in July 2002, First Capital Financial's stock fell 60% in two days after the company voluntarily disclosed a disagreement between them and two government regulators: How much capital did they ...
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