function Menu(id, x, y, width, overCol, backCol, borderCol)
{
    this.id = id;
    this.x = x;
    this.y = y;
    this.width = width;

    this.overCol = overCol;
    this.backCol = backCol;
    this.borderCol = borderCol;

    this.parentMenu = null;
    this.parentItem = null;
}
这段代码中this.overCol = overCol;
    this.backCol = backCol;
    this.borderCol = borderCol;
这几个值我想写到css里来控制，请问如何改写呢？