javascript - JQuery:无法通过 $.each 循环动态数组

Question

为什么不能通过 $.each() 循环动态数组？

var array = [];
array['one'] = 'two';
$.each(array, function( key, value )
{
    //not get in loop
    alert(value);
});

Answer 1

对于数组，$.each() 仅循环遍历编号索引。如果你想遍历命名属性，你必须使用一个对象。

var obj = {};
obj['one'] = 'two';
$.each(obj, function( key, value )
{
    console.log(key, value);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

这在 documentation 中有解释:

Arrays and array-like objects with a length property (such as a function's arguments object) are iterated by numeric index, from 0 to length-1. Other objects are iterated via their named properties.