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>