Twitter主题设置仿mac UI 语法高亮代码方法

#post-content pre code {
    display:block;
    overflow-x:auto;
    position:relative;
    margin:0;
    padding-left:50px;
}
pre code {
    position:relative;
    display:block;
    overflow-x:auto;
    margin:4.4px 0.px .4px 1px;
    padding:0;
    max-height:500px;
    padding-left:3.5em
}

if (typeof Prism !== 'undefined') {
var pres = document.getElementsByTagName('pre');
                for (var i = 0; i < pres.length; i++){
                    if (pres[i].getElementsByTagName('code').length > 0)
                        pres[i].className  = 'line-numbers';}
Prism.highlightAll(true,null);}