适配各种移动设备的mediaquery

/* Desktops and laptops ----------- */
    @media only screen
    and (min-width : 1224px) {
    /* Styles */
    }
     
    /* Large screens ----------- */
    @media only screen
    and (min-width : 1824px) {
    /* Styles */
    }
    
    /* old Smartphones (portrait and landscape) ----------- */
    @media only screen
    and (min-device-width : 320px)
    and (max-device-width : 480px) {
    /* Styles */
    }
     
    /* old Smartphones (landscape) ----------- */
    @media only screen
    and (min-width : 321px) {
    /* Styles */
    }
     
    /* old Smartphones (portrait) ----------- */
    @media only screen
    and (max-width : 320px) {
    /* Styles */
    }
    
    /* iPhone 4 ----------- */
    @media
    only screen and (-webkit-min-device-pixel-ratio : 1.5),
    only screen and (min-device-pixel-ratio : 1.5) {
    /* Styles */
    }
     
    /* iPads (portrait and landscape) ----------- */
    @media only screen
    and (min-device-width : 768px)
    and (max-device-width : 1024px) {
    /* Styles */
    }
     
    /* iPads (landscape) ----------- */
    @media only screen
    and (min-device-width : 768px)
    and (max-device-width : 1024px)
    and (orientation : landscape) {
    /* Styles */
    }
     
    /* iPads (portrait) ----------- */
    @media only screen
    and (min-device-width : 768px)
    and (max-device-width : 1024px)
    and (orientation : portrait) {
    /* Styles */
    }
    
    /* Android Tablet (portrait and landscape) ----------- */
    @media only screen
    and (min-device-width : 800px)
    and (max-device-width : 1280px) {
    /* Styles */
    }
     
    /* Android Tablet (landscape) ----------- */
    @media only screen
    and (min-device-width : 800px)
    and (max-device-width : 1280px)
    and (orientation : landscape) {
    /* Styles */
    }
     
    /* Android Tablet (portrait) ----------- */
    @media only screen
    and (min-device-width : 800px)
    and (max-device-width : 1280px)
    and (orientation : portrait) {
    /* Styles */
    }
     
    /* Desire + Galaxy S2 (portrait and landscape) ----------- */
    @media only screen
    and (min-device-width : 480px)
    and (max-device-width : 800px) {
    /* Styles */
    }
     
    /* Desire + Galaxy S2 (landscape) ----------- */
    @media only screen
    and (min-device-width : 480px)
    and (max-device-width : 800px)
    and (orientation : landscape) {
    /* Styles */
    }
     
    /* Desire + Galaxy S2 (portrait) ----------- */
    @media only screen
    and (min-device-width : 480px)
    and (max-device-width : 800px)
    and (orientation : portrait) {
    /* Styles */
    }

转载自：http://snipplr.com/view.php?codeview&id=67341