querySelectorAll

document.querySelectorAll('.mygroup'); //returns all elements with class="mygroup" document.querySelectorAll('option[selected="selected"]'); //returns the default selected option within each SELECT menu document.querySelectorAll('#mytable tr>td:nth-of-type(1)'); //returns the first cell within each table row of "mytable"
使用javascript搜尋DOM，效能比JQUERY好

僅適用於IE8以上版本

http://www.javascriptkit.com/dhtmltutors/css_selectors_api.shtml

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