日期:2014-05-16 浏览次数:20405 次
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>js</title> <script> var data = initData(); function initData() { var data = []; for (var i = 0; i++ < 100000;) { data.push(randStr()); } return data; } function randStr() { var strs = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'; var result = ''; var len = 3 + Math.round(22 * Math.random()); //随即生成一个3-25个字符组成的字符串 for (var i = 0; i++ < len;) { result += strs[Math.round(52 * Math.random())]; } return result; } function t1() { var str = ''; var last = (new Date()).getTime(); for (var i = 0, d; d = data[i++];) { str += d; } $('t1').value = (new Date()).getTime() - last; return str; } function t2() { var arr = []; var last = (new Date()).getTime(); for (var i = 0, d; d = data[i++];) { arr.push(d); } $('t2').value = (new Date()).getTime() - last; return arr.join(''); } function t3() { var str = ''; var last = (new Date()).getTime(); for (var i = 0, d; d = data[i++];) { str = str.concat(d); } $('t3').value = (new Date()).getTime() - last; return str; } function $() { return document.getElementById(arguments[0]); } </script> </head> <body> <div style="width:400px;margin:40px auto;"> 用时:<input type="text" name="t1" value="" id="t1" readonly/>毫秒 <input type="button" name="b1" value=" + 连接" onclick="t1()"/> <br /> 用时:<input type="text" name="t2" value="" id="t2" readonly/>毫秒 <input type="button" name="b2" value="join 连接" onclick="t2()"/> <br /> 用时:<input type="text" name="t3" value="" id="t3" readonly/>毫秒 <input type="button" name="b3" value="concact 连接" onclick="t3()"/> <br /> </div> </body> </html>