Heim >Web-Frontend >js-Tutorial >Zusammenfassung der Methoden zum Hinzufügen von Elementen zu JavaScript-Arrays_Grundkenntnisse
Neues Element am Anfang des Arrays hinzufügen – unshift()
Quellcode:
<!DOCTYPE html> <html> <body> <p id="demo">Click the button to add elements to the array.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var fruits = ["Banana", "Orange", "Apple", "Mango"]; fruits.unshift("Lemon","Pineapple"); var x=document.getElementById("demo"); x.innerHTML=fruits; } </script> <p><b>Note:</b> The unshift() method does not work properly in Internet Explorer 8 and earlier, the values will be inserted, but the return value will be <em>undefined</em>.</p> </body> </html>
Testergebnisse:
Lemon,Pineapple,Banana,Orange,Apple,Mango
Fügen Sie ein Element an Position 2 des Arrays hinzu – splice()
Quellcode:
<!DOCTYPE html> <html> <body> ​ <p id="demo">Click the button to add elements to the array.</p> ​ <button onclick="myFunction()">Try it</button> ​ <script> function myFunction() { var fruits = ["Banana", "Orange", "Apple", "Mango"]; fruits.splice(2,0,"Lemon","Kiwi"); var x=document.getElementById("demo"); x.innerHTML=fruits; } </script> ​ </body> </html>
Testergebnisse:
Banana,Orange,Lemon,Kiwi,Apple,Mango
Neue Elemente am Ende des Arrays hinzufügen – push()
Quellcode:
<!DOCTYPE html> <html> <body> ​ <p id="demo">Click the button to add a new element to the array.</p> ​ <button onclick="myFunction()">Try it</button> ​ <script> var fruits = ["Banana", "Orange", "Apple", "Mango"]; ​ function myFunction() { fruits.push("Kiwi") var x=document.getElementById("demo"); x.innerHTML=fruits; } </script> ​ </body> </html>
Testergebnisse:
Banana,Orange,Apple,Mango,Kiwi