快速排序 php与javascript的不同之处_javascript技巧-JS Tutorial-php.cn

快速排序 php与javascript的不同之处_javascript技巧

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Release： 2016-05-16 18:10:29

Original

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1. PHP

 
$unsorted = array(2,4,5,63,4,5,63,2,4,43); 
function quicksort($array) 
{ 
if (count($array) == 0) 
return array(); 
$pivot = $array[0]; 
$left = $right = array(); 
for ($i = 1; $i if ($array[$i] $left[] = $array[$i]; 
else 
$right[] = $array[$i]; 
} 
return array_merge(quicksort($left), array($pivot), quicksort($right)); 
} 
$sorted = quicksort($unsorted); 
print_r($sorted); 

2. JavaScript

复制代码代码如下:

 
var a = [2,4,5,63,4,5,63,2,4,43]; 
function quicksort(arr) 
{ 
if (arr.length == 0) 
return []; 
var left = new Array(); 
var right = new Array(); 
var pivot = arr[0]; 
for (var i = 1; i if (arr[i] left.push(arr[i]); 
} else { 
right.push(arr[i]); 
} 
} 
return quicksort(left).concat(pivot, quicksort(right)); 
} 
console.log(quicksort(a)); 

注意，第一个条件语句是很重要的！而在PHP中COUNT函数将返回一个NULL值或空数组或0代替，你可以像count（$array）

复制代码代码如下:

if (count($array) return $array;

在JavaScript中你无法使用，由于对'未定义'的值时，存在一个“空“数组作为参数传递。因此，需要包含上面的条件：

复制代码代码如下:

 
// this will result with an error 
if (arr.length return arr; 

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快速排序 php与javascript的不同之处_javascript技巧