javascript:
a. 代码:

var arr = new Array(1,2,3,4)for(var i in arr){if(arr[i]%2 == 0){ arr.splice(i,1)}}console.log(arr)

b. 输出:

[ 1, 3 ]php:
a. 代码:

<?php$arr = array(1,2,3,4);foreach ($arr as $k=>$v){if($v%2 == 0){ unset($arr[$k]);}}var_dump($arr);

b. 输出:

array(2) {[0]=>int(1)[2]=>int(3)}