所以这是相等操作符，然而那个单等号是一个赋值运算符。
So this is the equality operator, whereas the single equal sign is the assignment operator.
所有的赋值运算符都返回赋给左操作数的值。
All assignment operators return the value that is assigned to the left operand.
“一元运算符”是一种对单个操作数进行运算的运算符。
A unary operator is an operator that operates on a single operand.
“一元运算符”是一种对单个操作数进行运算的运算符。
A unary operator is an operator that operates on a single operand.
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