临时变量未存储在 Javascript 中答案

【问题标题】：Temporary Variable Not Being Stored In Javascript临时变量未存储在 Javascript 中
【发布时间】：2016-06-18 11:27:18
【问题描述】：

我正在构建一个排序算法（Selection Sort）并且已经能够完成它。但是，如果我想添加一个临时变量，它存储未排序的数组，它似乎立即更改为已排序的数组：

 var A = [-8, 1, 77, -99, 3, 5];
 function findMin(A,startIndex,endIndex) {
 var temp = startIndex;
 for(var x = startIndex; x <= endIndex; x++){


 if(A[temp] > A[x]) {

   temp = x;

}

}
return temp;
}
function swapNumbers(A, index1, index2) {
var temp_2 = A[index1];
A[index1] = A[index2];
A[index2] = temp_2;

return A;
}

function sort(A) {
var endofArray = A.length - 1;
var temp3 = A;
var Asorted = [];
for(var i = 0; i < A.length; i++) {
    swapNumbers(A, i, findMin(A, i, endofArray));

}
Asorted = A;
console.log("The unsorted array was " + "[" + temp3 + "]" 
+ "." + " The sorted array is " + "[" + Asorted + "]" + "."); 
return Asorted; /*subsitute return for 
console.log() to display results*/
}
sort(A);

console.log("The unsorted array was " + "[" + temp3 + "]" + "." + " The sorted array is " + "[" + Asorted + "]" + "."); 中的temp3 似乎输出：

The unsorted array was [-99,-8,1,3,5,77]. The sorted array is [-99,-8,1,3,5,77].

代替：

The unsorted array was [-8, 1, 77, -99, 3, 5]. The sorted array is [-99,-8,1,3,5,77].

请告诉我我的错误。 `

【问题讨论】：

stackoverflow.com/questions/7486085/…

标签： javascript arrays sorting selection-sort

【解决方案1】：

当您将 temp3 分配给 A 时，您基本上只是指向内存中的 A 数组，而不是实际复制该数组。试试：

var temp3 = A.slice();

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slice

【讨论】：