Assignment to constant variable. 报错

常量是使用const关键字定义的，一旦声明就不能修改其值。所以当我们尝试给常量赋值时，会报错"Assignment to constant variable"。这个错误是因为我们修改了一个常量的值，但常量是不可变的。这种错误在某些浏览器上可能不会报错，但是对常量的修改是无效的。所以在声明常量时，必须立即初始化它的值，不能在之后再赋值。<em>1</em><em>2</em>
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