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向数组指定位置添加元素:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
</body>
<script>
var array = ["one", "two", "four"];
console.log(array);
//在指定位置添加元素,第一个参数指定位置,第二个参数指定要删除的元素,如果为0,则追加
array.splice(2, 0, "three");
console.log(array);
</script>
</html>