javascript中,往数组中插入,替换元素
转载自http://www.tuicool.com/articles/vyUFneU
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:
var arr =newArray(6);
arr[0] ="George";
arr[1] ="John";
arr[2] ="Thomas";
arr[3] ="James";
arr[4] ="Adrew";
arr[5] ="Martin";
document.write(arr +"");
arr.splice(2,0,"William");
document.write(arr +"")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:
var arr =newArray(6);
arr[0] ="George";
arr[1] ="John";
arr[2] ="Thomas";
arr[3] ="James";
arr[4] ="Adrew";
arr[5] ="Martin";
document.write(arr +"");
arr.splice(2,1,"William");
document.write(arr)
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:
var arr =newArray(6);
arr[0] ="George";
arr[1] ="John";
arr[2] ="Thomas";
arr[3] ="James";
arr[4] ="Adrew";
arr[5] ="Martin";
document.write(arr +"");
arr.splice(2,3,"William")
document.write(arr)
输出:
George,John,Thomas,James,Adrew,Martin
George,John,William,Martin