bootStrap @media 用法

一. @media 格式

@media all and (min-width:xxx) and (max-width:xxx) (亦可以寫成@media all and (min-width:xxx) and (max-width:xxx)) {
/*這段查詢的all是針對所有設備(有些設備不一定是屏幕，也許是打字機，盲人閱讀器)*/
}

@media only screen and (min-width:xxx) and (max-width:xxx){
/*上面針對了所有設備，這段是只(only)針對彩色屏幕設備*/
}

@media only screen and (min-width:1024px) and (max-width:1292px){
    body div{
        font-size:30px;
        color:red;
    }
}