向JavaScript的数组中添加元素的方法小结

在数组的开头添加新元素 - unshift（）
源代码:

<！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>

测试结果:

Lemon,Pineapple,Banana,Orange,Apple,Mango

在数组的第2位置添加一个元素 - splice（）
源代码:

<！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>

测试结果:

Banana,Orange,Lemon,Kiwi,Apple,Mango

数组的末尾添加新的元素 - push（）
源代码:

<！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>

测试结果:

Banana,Orange,Apple,Mango,Kiwi