字符串数组上的jQuery.unique [英] jQuery.unique on an array of strings

问题描述

jQuery.unique() 的描述为:

The description of jQuery.unique() states:

对DOM元素数组进行适当排序，并删除重复项.请注意，这仅适用于DOM元素数组，不适用于字符串或数字.

牢记描述，有人可以解释为什么下面的代码起作用吗?

With the description in mind, can someone explain why the code below works?

<div></div>
<div></div>​

---

var arr = ['foo', 'bar', 'bar'];

$.each(arr, function(i, value){
    $('div').eq(0).append(value + ' ');
});

$.each($.unique(arr), function(i, value){
    $('div').eq(1).append(value  + ' ');
});
​

http://jsfiddle.net/essX2/

谢谢

可能的解决方案:

function unique(arr) {
var i,
    len = arr.length,
    out = [],
    obj = { };

for (i = 0; i < len; i++) {
    obj[arr[i]] = 0;
}
for (i in obj) {
    out.push(i);
}
return out;
};

推荐答案

它可以在数组字符串等上工作，但尚未针对该用途进行设计...

It might work on an array strings, etc, but it has not been designed for that use...

注意，unique()的代码在Sizzle中隐藏为uniqueSort: github来源

Notice that the code for unique() is hiding in Sizzle as uniqueSort: github source

尽管其中一些额外的代码似乎可以在任何数组上运行，但请密切注意sortOrder

While some of that extra code might seem like it would work on any array, pay close attention to sortOrder as defined here. It does a lot of extra work to put things in "document order" - hence why the documentation states that it should only be used on arrays of DOM elements.

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