在javascript中克隆多维数组 [英] Clone Multidimensional Array in javascript

问题描述

我想克隆一个多维数组，这样我就可以在不影响主数组的情况下使用克隆数组.

I want to make a clone of multidimensional Array so that i can play arround with the clone array without affecting main Array.

Array.prototype.clone = function () { 
   var newArray = new Array(this.length);
     for(var i=0; i < this.length; i++ ){
        newArray[i] = this[i];
   }
   return newArray;
};

但是问题是因为它使用数组原型，所以它会克隆我的所有数组.所以任何人都可以告诉我这样做的最佳方法是什么.

But problem which is since it is using array prototype so it will clone my all array.so can any body tell me what is the best way of doing this.

推荐答案

需要使用递归

var a = [1,2,[3,4,[5,6]]];

Array.prototype.clone = function() {
    var arr = [];
    for( var i = 0; i < this.length; i++ ) {
//      if( this[i].constructor == this.constructor ) {
        if( this[i].clone ) {
            //recursion
            arr[i] = this[i].clone();
            break;
        }
        arr[i] = this[i];
    }
    return arr;
}

var b = a.clone()

console.log(a);
console.log(b);

b[2][0] = 'a';

console.log(a);
console.log(b);

/*
[1, 2, [3, 4, [5, 6]]]
[1, 2, [3, 4, [5, 6]]]
[1, 2, [3, 4, [5, 6]]]
[1, 2, ["a", 4, [5, 6]]]
*/

原始数组中的任何其他对象将通过引用复制

Any other objects in the original array will be copied by reference though

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