Loop after the for loop scope has ended will now fail to compile 循环范围结束后的使用，则此代码在编译时将失败。
2.
For loop s initializer remains in scope until the local scope ends 循环的初始值设定项保持在范围内，直到局部范围结束。
3.
This means that its value resets to its default value at the end of reach request ( when the page is detached from the request ) 这意味着当请求范围结束后他的值将被设回默认值（当页面被丛请求中分离时） 。
