Question

我试图在每次运行此函数时创建一个单独的数组，目前它似乎每次运行时都会写入该函数。

我将如何做到这一点？任何帮助表示感谢，谢谢。

<script>
var a = [[4,1,2],[3,7,9],[2,3,5]];

function swap(x,y,m,n){
    var src=x;
    var dest = y;
    var tmp = a[x][y];
    a[x][y] = a[m][n];
    a[m][n] = tmp;
    newArray = new Array(a);
    return newArray;
}

var tmp1 = new Array(swap(1,0,0,0));
var tmp2 = new Array(swap(1,0,2,0));
document.write(tmp1 + "<br>" + tmp2 + " <br>" + a);
</script>

Answer 1

声明变量＆＃34; b＆＃34;在函数内部，它作为数组＆＃34; a＆＃34;的临时副本，阻止在函数期间更改它。

   <script>
    var a = [[4,1,2],[3,7,9],[2,3,5]];

    function swap(x,y,m,n){
        var b = a;
        var src=x;
        var dest = y;
        var tmp = b[x][y];
        b[x][y] = b[m][n];
        b[m][n] = tmp;
        newArray = new Array(b);
        return newArray;
    }

    var tmp1 = new Array(swap(1,0,0,0));
    var tmp2 = new Array(swap(1,0,2,0));
    document.write(tmp1 + "<br>" + tmp2 + " <br>" + a);
    </script>

从函数javascript创建多个数组

1 个答案: