日期:2014-05-16 浏览次数:20391 次
<html> <head> <title>test page</title> <script type='text/javascript'> <!-- function createTable() { var t = document.createElement('table'); for (var i = 0; i < 2000; i++) { var r = t.insertRow(0); for (var j = 0; j < 5; j++) { var c = r.insertCell(0); c.innerHTML = i + ',' + j; } } document.getElementById('table1').appendChild(t); t.setAttribute('border', '1'); } function createTable2() { var t = document.createElement('table'); var b = document.createElement('tbody'); for (var i = 0; i < 2000; i++) { var r = document.createElement('tr'); for (var j = 0; j < 5; j++) { var c = document.createElement('td'); var m = document.createTextNode(i + ',' + j); c.appendChild(m); r.appendChild(c); } b.appendChild(r); } t.appendChild(b); document.getElementById('table1').appendChild(t); t.setAttribute('border', '1'); } function createTable3() { var data = ''; data += '<table border=1><tbody>'; for (var i = 0; i < 2000; i++) { data += '<tr>'; for (var j = 0; j < 5; j++) { data += '<td>' + i + ',' + j + '</td>'; } data += '</tr>'; } data += '</tbody><table>'; document.getElementById('table1').innerHTML = data; } function createTable4() { var data = new Array(); data.push('<table border=1><tbody>'); for (var i = 0; i < 2000; i++) { data.push('<tr>'); for (var j = 0; j < 5; j++) { data.push('<td>' + i + ',' + j + '</td>'); } data.push('</tr>'); } data.push('</tbody><table>'); document.getElementById('table1').innerHTML = data.join(''); } function showFunctionRunTime(f) { var t1 = new Date(); f(); var t2 = new Date(); alert(t2 - t1); } //--> </script> </head> <body> <div id="table1" style="border: 1px solid black"> </div> <script> showFunctionRunTime(createTable); showFunctionRunTime(createTable2); showFunctionRunTime(createTable3); showFunctionRunTime(createTable4); </script> </body> </html>?