赋值运算符(=)

简单赋值操作符(=)用于为变量赋值。赋值表达式本身的值为其完成后被赋值的变量的值。为了给多个变量赋一个值，可以链式使用赋值操作符。

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Operator: x = y

// 假设已经存在以下变量
//  x = 5
//  y = 10
//  z = 25

x = y     // x 为 10
x = y = z // x, y 都为 25

• Assignment operators in the JS guide