slice and splice

I believe that many people who learn the JavaScript language will often be confused about the slice and splice methods. Although they have similar names, they have completely different functions. So this article will give you a detailed review of

Objective Today I revisit the JavaScript, see the array method, there are two of the more similar methods--splice and splice, look like, is more than one P, but the usage is quite different. In use, you can reduce confusion by selecting an API

JavaScript Slice () method Definitions and usage The slice () method returns the selected element from an existing array. GrammarArrayobject.slice (start,end) parameter descriptionStart Required. Specify where to start the selection. If it is a

Array. slice () and Array. splice () return value types recently used in an exercise. Array. slice () and Array. splice (). Array. slice () returns Array-an Array consisting of elements in a certain range in the original Array. Array. splice ()

ArticleDirectory 1. Slice 2. splice Today, I reviewed JavaScript and saw the array method. Two of them are similar: splice and splice. They look very similar, but they have a P, but their usage is quite different. 1. Slice Slice

The substr () method extracts a specified number of characters starting with the start subscript from a string.StringObject. substr (start, length); start is required. length is optional. Start is the subscript of the starting position of the

The substr () method extracts a specified number of characters starting with the start subscript from a string. StringObject. substr (start, length); start is required. length is optional. Start is the subscript of the starting position of the

I used array. Slice () and array. splice () in my previous exercise. Array. Slice () returns array-an array consisting of elements in a certain range in the original array. Array. splice () returns array-an array containing elements deleted from the

POP deletes last item Deletes the last item and returns the value of the deleted element, or returns Undefine if the array is empty var a = [1,2,3,4,5]; A.pop ();//a:[1, 2, 3, 4] a.pop ();//a:[1, 2, 3] Shift deletes the first item

The Concat () method can create a new array based on all the items in the current array. Specifically, this method will first create a copy of the current array, then add the received parameters to the end of the copy, and finally return the newly