首页 \ 问答 \ 如何使用jQuery生成动态ID?(How to generate dynamic id using jQuery?)

如何使用jQuery生成动态ID?(How to generate dynamic id using jQuery?)

我想将渐进ID添加到无序HTML列表中的一系列元素。 我使用jQuery .each()方法来获取列表中的每个<li> ,并在每个<li>添加一个<span> <li> 。 然后我添加了以每个()的索引作为编号的ID属性。

$('#menu li ul li').each(function(i, e){
    $(this).append('<span class="arr"></span>');
    $(".arr").attr("id", "id_" + i);
});

小提琴演示

但是我得到了所有元素的id_3 。 为什么? 我做错了什么?

谢谢你的帮助!


I want to add progressive id to a series of elements on an unordered HTML list. I used the jQuery .each() method to get each <li> of the List and append a <span> inside each <li>. Then I added the ID attribute with index of each() as number.

$('#menu li ul li').each(function(i, e){
    $(this).append('<span class="arr"></span>');
    $(".arr").attr("id", "id_" + i);
});

Fiddle Demo

But I get id_3 for all elements. Why? What did I do wrong?

Thanks for any help!


原文:https://stackoverflow.com/questions/22913512
更新时间:2022-02-24 13:02

最满意答案

从MySQL参考手册https://dev.mysql.com/doc/refman/5.7/en/concurrent-inserts.html

如果存在多个INSERT语句,则它们将与SELECT语句同时排队并执行。

由于MySQL不会同时插入记录,因此可以使用单个线程并避免死锁。

如果你必须有多线程的INSERT,可以考虑使用try-catch块。 如果发生死锁,请尝试再次插入。 如果最终陷入无限循环,请放置一个计数器,并且不要尝试永久插入。 请尝试仅插入预定义的时间(计数器)。


From MySQL Reference Manual https://dev.mysql.com/doc/refman/5.7/en/concurrent-inserts.html

If there are multiple INSERT statements, they are queued and performed in sequence, concurrently with the SELECT statements.

Since MySQL does not insert records simultaneously, you can use a single thread and avoid deadlocks.

If you must have multi threads that INSERT, consider using try-catch blocks. If deadlock occurs, try to insert again. If you end up in an infinite loop, put a counter and don't try to insert forever. Instead try to insert only a predefined time(counter) by you.

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