Introduction to JS array assignment_javascript skills

Copy code The code is as follows:

var test=[1,2,3,4, 5,6,7];

var arr=test;
arr.splice(2,1);
alert(test);//1,2,4,5,6,7

JS arrays are essentially objects. Therefore, the above source code finally prints 1,2,3,4,5,6. This is because assigning test to arr actually assigns the reference of the array to arr, so operating arr will also

Change the source array.

To implement array cloning, the following methods can be used:

Copy the code The code is as follows:

Array.prototype.clone=function(){
return this.slice(0);
}