Performs a bitwise or on two expressions, and assigns the result to the first argument.

在两个运算式上执行位元OR，并将结果指派给第一个引数。

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The compiler implicitly widened and sign-extended a variable, and then used the resulting value in a bitwise OR operation.

编译器隐含地扩大并正负号扩展了变数，然后在位元的OR运算中使用该结果值。

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This line of code executes a bitwise OR operation between firstLengthByte and 0x80 (1000 0000) and stores the result in firstLengthByte.

这一行代码对 firstLengthByte和 0x80 （ 1000 0000）进行按拉 OR操作，并将结果储存到 firstLengthByte 中。

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