js中數組的增刪改查
阿新 • • 發佈:2017-12-31
tro ear get slice tel tle 歷史 click demo
1 slice選取數組的的一部分,並返回一個新數組
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<p id="demo">點擊按鈕截取數組下標 1 到 2 的元素。</p>
<button onclick="myFunction()">點我</button>
<script>
function myFunction(){
var fruits = ["語文", "數學", "英文", "地理", "歷史"];
var citrus = fruits.slice(1,3);
var x=document.getElementById("demo");
x.innerHTML=citrus;
}
</script>
</body>
</html>
2 splice 從數組中添加或刪除元素
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<p id="demo">點擊按鈕向數組添加元素。</p>
<button onclick="myFunction()">點我</button>
<script>
function myFunction(){
var fruits = ["語文", "數學", "英文", "地理", "歷史"];
fruits.splice(2,0,"美術","體育");
var x=document.getElementById("demo");
x.innerHTML=fruits;
}
</script>
</body>
</html>
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js中數組的增刪改查