js switch与elseif做浏览器执行速度对比
<script type="text/javascript">var count,n;var startTimeSwitch = new Date().getTime();count = 10000;sum = count;n = 9;while (sum>0) {switch (n) {case 1 :sum--;break;case 2 :sum--;break;case 3 :sum--;break;case 4 :sum--;break;case 5 :sum--;break;case 6 :sum--;break;case 7 :sum--;break;case 8 :sum--;break;case 9 :sum--;break;case 10 :sum--;break;default :sum--;break;}}var endTimeSwitch = new Date().getTime();var startTimeElseIf = new Date().getTime();sum = count;while(sum>0){if (n == 1) {sum--;}else if (n == 2) {sum--;}else if (n == 3) {sum--;}else if (n == 4) {sum--;}else if (n == 5) {sum--;}else if (n == 6) {sum--;}else if (n == 7) {sum--;}else if (n == 8) {sum--;}else if (n == 9) {sum--;}else if (n == 10) {sum--;}else {sum--;}}var endTimeElseIf = new Date().getTime();alert("switch共用时:"+(endTimeSwitch-startTimeSwitch)+"毫秒---elseif共用时:"+(endTimeElseIf-startTimeElseIf)+"毫秒");</script>countIE9(毫秒)switch/elseifFireFox-v10.2(毫秒)switch/elseifchrome-v19(毫秒)switch/elseif1000/01/10/010000/01/10/0100000/02/10/21000001/32/24/1100000017/205/1315/1010000000108/11916/8586/52100000000974/1156261/838637/51610000000009028/129182553/86696164/5483
测试结果很意外，chrome对switch与elseif执行速度几乎持平，在chrome下使用elseif会更好些。
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