在JavaScript的陣列中新增元素的方法小結_基礎知識
- WBOY原創
- 2016-05-16 15:35:131609瀏覽
在陣列的開頭新增元素 - unshift()
原始碼:
<!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>
測試結果:
Lemon,Pineapple,Banana,Orange,Apple,Mango
在陣列的第2位置加入一個元素 - splice()
原始碼:
<!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>
測試結果:
Banana,Orange,Lemon,Kiwi,Apple,Mango
數組的末尾添加新的元素 - push()
原始碼:
<!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>
測試結果:
Banana,Orange,Apple,Mango,Kiwi
陳述：
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