The JavaScript splice() method steps on the pit

Using this method, the data source will be modified directly, and reassignment cannot be done, because it returns the deleted item, and often, what we need is the deleted source number object
 
 
Execute a sentence.
this.buy_list.splice(index,1)
not like this:
var a = this.buy_list.splice(index,1)

Definition and Usage

The splice() method adds/removes items to/from the array and returns the removed item.

Note: This method mutates the original array.

grammar

arrayObject.splice(index,howmany,item1,.....,itemX)
parameter describe
index Required. Integer specifying the position to add/remove items, use a negative number to specify the position from the end of the array.
howmany Required. The number of items to delete. If set to 0, the item will not be deleted.
item1, ..., itemX Optional. New item added to the array.

return value

Types of describe
Array A new array containing the deleted items, if any.
 

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