二级下拉渐变菜单导航

分享一个简单通用的企业菜单导航，有下拉二级菜单的效果，代码很简单。

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HTML

<ul>
    <li><a href="http://www.sucaiq.com">Home</a>
        <ul>
            <li><a href="http://www.sucaiq.com">Sub Menu Item 1</a></li>
            <li><a href="#">Sub Menu Item 2</a></li>
            <li><a href="#">Sub Menu Item 3</a></li>
            <li><a href="#">Sub Menu Item 4</a></li>
            <li><a href="#">Sub Menu Item 5</a></li>
        </ul>
    </li>
    <li>
        <a href="http://www.sucaiq.com">Services</a>
        <ul>
            <li><a href="#">Sub Menu Item 1</a></li>
            <li><a href="#">Sub Menu Item 2</a></li>
            <li><a href="http://www.sucaiq.com">Sub Menu Item 3</a></li>
            <li><a href="#">Sub Menu Item 4</a></li>
            <li><a href="#">Sub Menu Item 5</a></li>
        </ul>
    </li>
</ul>

jQuery

$(".main-navigation li").hover(function() {
    var itemwidth = $(this).width();
    /* Getting the LI width */
    $(this).prepend("<div class='hover'></div>");
    /* Inserting a blank div into within li above the <a> tag*/
    $(this).find("div").fadeIn('10000').css({
        'width': itemwidth
    });
    /* Using the itemwidth for the div to display properly*/
    $(this).find("ul").fadeIn('1000').slideDown('10000').css("display", "block");

},
function() {
    $(this).find("div").slideUp('1000').fadeOut('1000');
    /* sliding up and fading out the hover div */
    $(this).find("div").remove();
    /* removing the <div> code from html at every mouseout event*/
    $(this).find("ul").fadeOut('1000');
    /* fading out the sub menu */

});

$(".search-input").focus(function() {
    $(this).animate({
        width: '180px'
    },
    500);
    /* on focus, increasing the input width of search to left side*/
});

$(".search-input").focusout(function() {
    $(this).animate({
        width: '117px'
    },
    500);
    /* on focus, decreasing the input width of search to left side*/
});