jq对表格统计

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<!doctype html><html lang="en"><head><meta charset="UTF-8"><title>Document</title><script src="http://code.jquery.com/jquery-1.7.2.min.js"></script><script>function sumOfColumns(elem) {var total = 0;$(elem).find("tr").each(function(){var t=0;var num1=$(this).children("td:nth-child("+2+")").html();var num2=$(this).children("td:nth-child("+3+")").html();if(num1=="" || num2==""){alert('dsd');}else{t=parseInt(num1)/parseInt(num2);alert(t);}});return total;}$(function(){sumOfColumns(".data");});</script></head><body><table><thead><tr><td>col1</td><td>col2</td><td>col3</td></tr></thead><tbody class="data"><tr><td>1</td><td>100</td><td>200</td></tr><tr><td>2</td><td>20</td><td>40</td></tr><tr><td>3</td><td></td><td>55</td></tr></tbody></table></body></html>

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