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Copy array in JS

2022-04-23 08:25:00 【beinlife】

JS Copy array in


One 、 Wrong implementation
var array1 = new Array("1","2","3"); 
var array2; 
array2 = array1; 
array1.length = 0; 
alert(array2); // Return to empty
This is the wrong way , because javascript It is divided into original type and reference type （ And java、c# similar ）.Array Is a reference class

type .array2 What you get is a quote , So for array1 The changes will affect array2.


Two 、 Use slice()
You can use slice() replicate , because slice() Return is also an array .
var array1 = new Array("1","2","3"); 
var array2; 
array2 = array1.slice(0); 
array1.length = 0; 

alert(array2); // return 1、2、3  


3、 ... and 、 Use concat()
Be careful concat() The returned is not the calling function Array, It's a new Array, So you can use this to replicate .
var array1 = new Array("1","2","3"); 
var array2; 
array2 = array2.concat(array1); 
array1.length = 0; 

alert(array2); // return 1、2、3 


http://blog.sina.com.cn/s/blog_51baa1570100io8r.html

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本文为[beinlife]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/04/202204230734168920.html

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