导航栏Flash效果

Question

谁能帮忙分析一下妙味课堂导航栏的部分如同flash一样的效果是如何实现的，想学习制作一下。
http://www.miaov.com/

想用原生js写

Answer 1

动画是这两个div做的。你可以去控制台删了看看效果。宽度的变化。

<div class="box" style="left: 0px; top: 0px; width: 64px; -webkit-filter: blur(0px);">
    <div class="left" style="width: 0px; left: 0px; background: rgb(225, 86, 113);"></div>
    <div class="right" style="width: 0px; right: 0px; background: url(&quot;/static/normal/images/nav_bg.gif&quot;) repeat-x;"></div>
</div>

$(function() {
function e(e) {
    if (v = e.offsetLeft > o.offsetLeft ? 1 : e.offsetLeft < o.offsetLeft ? 2 : 0) {
        var n = .8 * Math.abs(e.offsetLeft - o.offsetLeft);
        e.index != y && (o.style.filter = "blur(2px)", o.style.WebkitFilter = "blur(2px)"),
        move(o, {
            left: e.offsetLeft,
            width: e.offsetWidth
        },
        n, "easeOut",
        function() {
            switch (v) {
            case 1:
                t();
                break;
            case 2:
                i();
                break;
            default:
                move(l, {
                    width: 0,
                    right: 0
                },
                30),
                move(f, {
                    width: 0,
                    left: 0
                },
                30)
            }
            o.style.filter = "blur(0)",
            o.style.WebkitFilter = "blur(0)"
        }),
        e.offsetLeft > o.offsetLeft ? (l.style.background = "#e15671", f.style.background = "url(/static/normal/images/nav_bg.gif) repeat-x", move(l, {
            width: 40,
            right: -20
        },
        150), move(f, {
            width: 40,
            left: -20
        },
        150)) : e.offsetLeft < o.offsetLeft && (l.style.background = "url(/static/normal/images/nav_bg.gif) repeat-x", f.style.background = "#e15671", move(l, {
            width: 40,
            right: -20
        },
        150), move(f, {
            width: 40,
            left: -20
        },
        150)),
        y = e.index
    }
}
function t() {
    move(l, {
        width: 0,
        right: 0
    },
    80, "linear",
    function() {
        l.style.background = "url(/static/normal/images/nav_bg.gif) repeat-x",
        move(l, {
            width: 20,
            right: -10
        },
        80, "linear",
        function() {
            move(l, {
                width: 0,
                right: 0
            },
            50, "linear")
        })
    }),
    move(f, {
        width: 0,
        left: 0
    },
    80, "linear",
    function() {
        f.style.background = "#e15671",
        move(f, {
            width: 20,
            left: -10
        },
        80, "linear",
        function() {
            move(f, {
                width: 0,
                left: 0
            },
            50, "linear")
        })
    })
}
function i() {
    move(l, {
        width: 0,
        right: 0
    },
    80, "linear",
    function() {
        l.style.background = "url(/static/normal/images/nav_bg.gif) repeat-x",
        move(l, {
            width: 20,
            right: -10
        },
        80, "linear",
        function() {
            move(l, {
                width: 0,
                right: 0
            },
            50, "linear")
        })
    }),
    move(f, {
        width: 0,
        left: 0
    },
    80, "linear",
    function() {
        f.style.background = "#e15671",
        move(f, {
            width: 20,
            left: -10
        },
        80, "linear",
        function() {
            move(f, {
                width: 0,
                left: 0
            },
            50, "linear")
        })
    })
}
var n = document.getElementsByTagName("nav")[0],
o = n.getElementsByClassName("box")[0],
l = n.getElementsByClassName("right")[0],
f = n.getElementsByClassName("left")[0],
a = n.getElementsByTagName("ul")[0],
s = a.getElementsByTagName("li"),
m = n.getElementsByClassName("logo")[0],
r = (m.getElementsByClassName("text"), m.getElementsByTagName("img")),
g = m.getElementsByTagName("span")[0],
u = m.getElementsByClassName("logoAll")[0],
c = s[initNum].offsetLeft,
h = s[0].offsetTop,
d = initNum,
y = 0,
v = 0,
b = !0,
p = 0;
o.style.left = c + "px",
o.style.top = h + "px",
o.style.width = s[initNum].offsetWidth + "px";
for (var w = 0; w < s.length; w++) s[w].index = w,
s[w].onmouseenter = function() {
    clearTimeout(p),
    e(this)
};
a.onmouseleave = function() {
    p = setTimeout(function() {
        e(s[d])
    },
    100)
},
m.onmouseenter = function() {
    b && (b = !1, r[0].style.transform = "scale(1.05)", r[1].style.top = "47px", r[2].style.top = "-25px", u.style.opacity = 0, g.style.left = "-100px", move(g, {
        left: 270
    },
    300, "linear",
    function() {
        move(r[1], {
            top: 0
        },
        300),
        move(r[2], {
            top: 0
        },
        300, "linear",
        function() {
            move(u, {
                opacity: 1
            },
            300, "linear",
            function() {
                b = !0
            })
        })
    }))
},
m.onmouseleave = function() {
    r[0].style.transform = "scale(1)"
}

});