添加shiv让所有现代浏览器都支持 HTML5 语义元素 html5.js让IE（包括IE6）支持HTML5元素方法

引用Google的html5.js文件

<!--[if IE]>
<script src=”http://html5shiv.googlecode.com/svn/trunk/html5.js”></script>
< ![endif]-->

将上代码复制到head部分，记住一定要是head部分（因为IE必须在元素解析前知道这个元素，所以这个js文件不能在其他位置调用，否则失效）

当然，你也可以把代码拿出来自己看着办：html5.js

/*
 HTML5 Shiv v3.6.2pre | @afarkas @jdalton @jon_neal @rem | MIT/GPL2 Licensed
 Uncompressed source: https://github.com/aFarkas/html5shiv
*/
(function(l, f) {
    function m() {
        var a = e.elements;
        return "string" == typeof a ? a.split(" ") : a
    }

    function i(a) {
        var b = n[a[o]];
        b || (b = {}, h++, a[o] = h, n[h] = b);
        return b
    }

    function p(a, b, c) {
        b || (b = f);
        if (g) return b.createElement(a);
        c || (c = i(b));
        b = c.cache[a] ? c.cache[a].cloneNode() : r.test(a) ? (c.cache[a] = c.createElem(a)).cloneNode() : c.createElem(a);
        return b.canHaveChildren && !s.test(a) ? c.frag.appendChild(b) : b
    }

    function t(a, b) {
        if (!b.cache) b.cache = {}, b.createElem = a.createElement, b.createFrag = a.createDocumentFragment, b.frag = b.createFrag();
        a.createElement = function(c) {
            return !e.shivMethods ? b.createElem(c) : p(c, a, b)
        };
        a.createDocumentFragment = Function("h,f", "return function(){var n=f.cloneNode(),c=n.createElement;h.shivMethods&&(" + m().join().replace(/w+/g, function(a) {
            b.createElem(a);
            b.frag.createElement(a);
            return 'c("' + a + '")'
        }) + ");return n}")(e, b.frag)
    }

    function q(a) {
        a || (a = f);
        var b = i(a);
        if (e.shivCSS && !j && !b.hasCSS) {
            var c, d = a;
            c = d.createElement("p");
            d = d.getElementsByTagName("head")[0] || d.documentElement;
            c.innerHTML = "x<style>article,aside,figcaption,figure,footer,header,hgroup,main,nav,section{display:block}mark{background:#FF0;color:#000}</style>";
            c = d.insertBefore(c.lastChild, d.firstChild);
            b.hasCSS = !! c
        }
        g || t(a, b);
        return a
    }
    var k = l.html5 || {}, s = /^<|^(?:button|map|select|textarea|object|iframe|option|optgroup)$/i,
        r = /^(?:a|b|code|div|fieldset|h1|h2|h3|h4|h5|h6|i|label|li|ol|p|q|span|strong|style|table|tbody|td|th|tr|ul)$/i,
        j, o = "_html5shiv",
        h = 0,
        n = {}, g;
    (function() {
        try {
            var a = f.createElement("a");
            a.innerHTML = "<xyz></xyz>";
            j = "hidden" in a;
            var b;
            if (!(b = 1 == a.childNodes.length)) {
                f.createElement("a");
                var c = f.createDocumentFragment();
                b = "undefined" == typeof c.cloneNode ||
                    "undefined" == typeof c.createDocumentFragment || "undefined" == typeof c.createElement
            }
            g = b
        } catch (d) {
            g = j = !0
        }
    })();
    var e = {
        elements: k.elements || "abbr article aside audio bdi canvas data datalist details figcaption figure footer header hgroup main mark meter nav output progress section summary time video",
        version: "3.6.2pre",
        shivCSS: !1 !== k.shivCSS,
        supportsUnknownElements: g,
        shivMethods: !1 !== k.shivMethods,
        type: "default",
        shivDocument: q,
        createElement: p,
        createDocumentFragment: function(a, b) {
            a || (a = f);
            if (g) return a.createDocumentFragment();
            for (var b = b || i(a), c = b.frag.cloneNode(), d = 0, e = m(), h = e.length; d < h; d++) c.createElement(e[d]);
            return c
        }
    };
    l.html5 = e;
    q(f)
})(this, document);

最后在css里面加上这段：

/*html5*/
article,aside,dialog,footer,header,section,footer,nav,figure,menu{display:block}