JS Array deletes elements based on subscript

1. Create an array

The

code is as follows:


var array = new Array ();


var array = new Array (size);//Specifies the length of the array


var array = new Array (item1,item2......itemn);//Create an array and assign a value

2, take value, assign value

The

code is as follows:


var item = array[index];//Gets the value of the specified element


Array[index] = value;//Assign value to the specified element

3. Add new elements

The

code is as follows:


Array.push (ITEM1,ITEM2......ITEMN);//Add one or more elements to the array, returning the length of the new array


Array.unshift (ITEM1,ITEM2......ITEMN);//Adds one or more elements to the beginning of the array, the original element position is automatically moved back, and the length of the new array is returned


Array.splice (START,DELCOUNT,ITEM1,ITEM2......ITEMN);//Remove delcount elements from the start position and insert one or more new elements from the start position

4, delete elements

The

code is as follows:


Array.pop ()//deletes the last element and returns the element


array.shift ()//delete the first element, the array element position is automatically moved forward, and the deleted element is returned


Array.splice (Start,delcount);//delete delcount elements from start position

5, the integration of the array, interception

The

code is as follows:


Array.slice (start,end);


//Returns a portion of an array as an array, noting that the end-corresponding element is not included, and if the end is omitted all elements after start are copied


Array.concat (array1,array2);


//concatenation of multiple arrays into an array

6, sorting the array

The

code is as follows:


array.reverse ();//array inversion


Array.Sort ();//array sort, return array address

7, the array of the string

Array.join (separator);//connect array reason with separator

That's all there is to find a way to delete an array element! So I looked up some information and found a solution.
Removing an array element requires extending the array prototype prototype.

 

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Array.prototype.del=function (Index) {if (isNaN) | | Index>=this.length) {return false;} for (Var i=0,n=0;i if (This[i]!=this[index)) {this[n++]=this[i];} this.length-= 1; };