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JavaScript中获取元素索引的函数_javascript技巧

WBOY
Release: 2016-05-16 18:19:56
Original
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 这是我在写结构/表现/行为完全分离的选项卡(jQ版和原生JS版)一文时发现的问题. 今天一个朋友也问到我这个问题, 这个函数的确很实用. 和大家分享一下我的实现方法.
代码:

复制代码 代码如下:

function index(current, obj){
for (var i = 0; i if (obj[i] == current) {
return i;
}
}
}

原理:
通过一个for循环遍历找出当前集合中与当前元素相等的元素,那么该元素的下标值即是当前元素在元素集合中的索引值.

优化下:
复制代码 代码如下:
 
function index(current, obj){
for (var i = 0, length = obj.length; iif (obj[i] == current) {
return i;
}
}
}
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