splice() 方法向/从数组中添加/删除项目,然后返回被删除的项目。 注释:该方法会改变原始数组。
实例
例子 1 在本例中,我们将创建一个新数组,并向其添加一个元素: <script type="text/javascript"> var arr = new Array(6) arr[0] = "George" arr[1] = "John" arr[2] = "Thomas" arr[3] = "James" arr[4] = "Adrew" arr[5] = "Martin" document.write(arr + "<br />") arr.splice(2,0,"William") document.write(arr + "<br />") </script> 输出: George,John,Thomas,James,Adrew,Martin George,John,William,Thomas,James,Adrew,Martin 例子 2 在本例中我们将删除位于 index 2 的元素,并添加一个新元素来替代被删除的元素: <script type="text/javascript"> var arr = new Array(6) arr[0] = "George" arr[1] = "John" arr[2] = "Thomas" arr[3] = "James" arr[4] = "Adrew" arr[5] = "Martin" document.write(arr + "<br />") arr.splice(2,1,"William") document.write(arr) </script> 输出: George,John,Thomas,James,Adrew,Martin George,John,William,James,Adrew,Martin 例子 3 在本例中我们将删除从 index 2 ("Thomas") 开始的三个元素,并添加一个新元素 ("William") 来替代被删除的元素: <script type="text/javascript"> var arr = new Array(6) arr[0] = "George" arr[1] = "John" arr[2] = "Thomas" arr[3] = "James" arr[4] = "Adrew" arr[5] = "Martin" document.write(arr + "<br />") arr.splice(2,3,"William") document.write(arr) </script> 输出: George,John,Thomas,James,Adrew,Martin George,John,William,Martin
时间: 2024-11-19 16:39:05