Move declaration closer to usage
check variable for null
Move variable declaration and assignment to outer scope
split declaration and assignment
Move variable declaration to outer scope
inspection :"Local variable has too wide declaration scope"
将声明更接近使用
检查变量为null
将变量声明和赋值移动到外部作用域
拆分声明和分配
将变量声明移动到外部范围
检查：“局部变量声明范围太宽”