while语句

while语句用于循环，while语法如下：

while conditions do
    whilepart
end

实例：

-- while_test.lua
a = 10
while a < 20 do
    print("a is: " .. a)
    a = a + 1
end

执行结果如下：

$ lua while_test.lua
a is: 10
a is: 11
a is: 12
a is: 13
a is: 14
a is: 15
a is: 16
a is: 17
a is: 18
a is: 19

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