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In the previous article "JavaScript restricts the input box to only allow integers and decimal points (two methods)", I introduced how to use javascript to restrict the input box to only allow integers and decimal points. Interested Friends can learn about it~
What this article will explain is to teach you how to use JavaScript to delete the last item from an array.
Below I will explain how to use JavaScript to delete the last item from an array through 3 examples:
First sample code:
Note: This example uses the splice() method to remove the last item from the array.
<!DOCTYPE HTML> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body style="text-align:center;" id="body"> <h1 style="color:red;"> PHP中文网 </h1> <p id="GFG_UP" style="font-size: 16px;"> </p> <button onclick="gfg_Run()"> 删除最后一项 </button> <p id="GFG_DOWN" style="color:red; font-size: 20px; font-weight: bold;"> </p> <script> var el_up = document.getElementById("GFG_UP"); var el_down = document.getElementById("GFG_DOWN"); var array = [34, 24, 31, 48]; el_up.innerHTML = "Array = [" + array + "]"; function gfg_Run() { array.splice(-1, 1); el_down.innerHTML = "删除后的数组 = [" + array + "]"; } </script> </body> </html>
The running results are as follows:
JavaScript Array splice() method adds/removes items to/from the array and returns The item that was removed; this method mutates the original array.
Second sample code:
Note: This example uses the pop() method to remove the last item from the array.
<!DOCTYPE HTML> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body style="text-align:center;" id="body"> <h1 style="color:orange;"> PHP中文网 </h1> <p id="GFG_UP" style="font-size: 16px;"> </p> <button onclick="gfg_Run()"> 删除最后一项 </button> <p id="GFG_DOWN" style="color:orange; font-size: 20px; font-weight: bold;"> </p> <script> var el_up = document.getElementById("GFG_UP"); var el_down = document.getElementById("GFG_DOWN"); var array = [34, 24, 31, 48]; el_up.innerHTML = "Array = [" + array + "]"; function gfg_Run() { array.pop(); el_down.innerHTML = "删除后的数组 = [" + array + "]"; } </script> </body> </html>
The running results are as follows:
The JavaScript Array pop() method will delete the arrayObject , decrements the array length by 1 and returns the value of the element it removed. If the array is already empty, pop() does not modify the array and returns an undefined value.
Third code example:
Note: This example does not remove the last item from the array, instead using The slice() method returns a new array with the items removed.
<!DOCTYPE HTML> <html> <head> <meta charset="UTF-8"> <title></title> </head> <body style="text-align:center;" id="body"> <h1 style="color:pink;"> PHP中文网 </h1> <p id="GFG_UP" style="font-size: 16px;"> </p> <button onclick="gfg_Run()"> 删除最后一项 </button> <p id="GFG_DOWN" style="color:pink; font-size: 20px; font-weight: bold;"> </p> <script> var el_up = document.getElementById("GFG_UP"); var el_down = document.getElementById("GFG_DOWN"); var array = [34, 24, 31, 48]; el_up.innerHTML = "Array = [" + array + "]"; function gfg_Run() { el_down.innerHTML = "删除后的数组 = [" + array.slice(0, -1) + "]"; } </script> </body> </html>
The running results are as follows:
The JavaScript Array slice() method can return selected elements from an existing array , the slice() method can extract a certain part of the string and return the extracted part as a new string; the slice() method does not change the original array.
Finally, I would like to recommend "JavaScript Basics Tutorial" ~ Welcome everyone to learn ~
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