javascript中,往数组中插入,替换元素

2016-09-28  本文已影响0人  靳刘杰

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

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