js向数组中插入元素

1、在数组的开头添加新元素 - unshift()


function myFunction(){
  var fruits = ["Banana", "Orange", "Apple", "Mango"];
  fruits.unshift("Lemon","Pineapple");
  var x=document.getElementById("demo");
  x.innerHTML=fruits;
}

结果:

Lemon,Pineapple,Banana,Orange,Apple,Mango


2、在数组的第2位置添加一个元素 - splice()



function myFunction()
{
  var fruits = ["Banana", "Orange", "Apple", "Mango"];
  fruits.splice(2,0,"Lemon","Kiwi");
  var x=document.getElementById("demo");
  x.innerHTML=fruits;
}

结果:Banana,Orange,Lemon,Kiwi,Apple,Mango

3、数组的末尾添加新的元素 - push()

var fruits = ["Banana", "Orange", "Apple", "Mango"];
function myFunction()
{
   fruits.push("Kiwi")
   var x=document.getElementById("demo");
   x.innerHTML=fruits;
}

 

结果:Banana,Orange,Apple,Mango,Kiwi

 

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